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1.
McFadden, Michael Patrick.
Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle.
Degree: MS, Animal Science, 1988, Virginia Tech
URL: http://hdl.handle.net/10919/43050 
► This study assessed the effects of prenatal androgen exposure during three periods, of gestation on the external genitalia, estrous cyclicity, postnatal growth, social dominance and…
(more)
▼ This study assessed the effects of prenatal androgen exposure
during three periods, of gestation on the external genitalia,
estrous cyclicity, postnatal growth, social dominance and
sexual behavior of female beef cattle. Pregnant cows
recieved 17a methyl-testosterone (250 mg/d, sq) on d 40 to
100 (group 1), 70 to 130 (group 2) or 100 to 160 (group 3)
of gestation. Control cows (group 0) received no treatment.
Group 1 females exhibited completely masculinized external.
genitalia. No vulval opening was present and the
ano-genital distance (A-g) was similar to that of control
male calves. Group 2 females exhibited small vulval openings
and enlarged clitoral structures while group 3 females exhibited
normally appearing female external genitalia. Anogenital
distances for the heifers in groups 2 and 3 were
similar to those of the control heifers. Androgen exposure
during the three periods of gestation did not affect age at puberty (P<.80), estrous cycle length (P<.63) or postnatal
growth (P<.60) of the heifers.
At 9, 16 and 21 mo of age, social dominance values (SDV)
were determined for each heifer by 3 min random pair contests
for a restricted feed source. The animal with the greatest
feed source control time was awarded a win. Social dominance
value was calculated as 10 times the number of wins divided
by the number of competitions for each animal. Group 3
heifers had significantly greater SDV values than group 1 and
2 females (P<.03). SDV did not differ among groups at 16 mo
of age (P<.59). Group 1 females had greater SDV than group
2 females at 21 mo of age (P<:.04).
At 9, 16 and 21, mo of age, sexual behavior of the heifers
was characterized by exposure of the heifers to a teaser female in estrus. Sexual behavior, as indicated by the number
of mounts, head placements and interest time, was lower for
group 3 females compared to females in groups 1 and 2 at 9
mo of age (P<.04). There were no treatment differences for
any sexual behavior variable at 16 or 21 mo of age.
These results indicate that there is little potential
for increasing postnatal growth or altering the estrous
cyclicity of female cattle by exposure of the fetus to
testosterone during the periods of gestation selected in this
study. External genitalia of females were masculinized by
androgen exposure during d-40 to 100 of gestation. Social
dominance values were increased and sexual behavior was reduced in females by exposure to androgen during d 100 to 160 of gestation. Social dominance values were increased and sexual behavior was reduced
in females by exposure to androgen during d 100 to 160
of gestation.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Akers, Robert Michael (committee member), Knight, James W. (committee member).
Subjects/Keywords: Beef cattle; LD5655.V855 1988.M349
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APA (6th Edition):
McFadden, M. P. (1988). Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43050
Chicago Manual of Style (16th Edition):
McFadden, Michael Patrick. “Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle.” 1988. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/43050.
MLA Handbook (7th Edition):
McFadden, Michael Patrick. “Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle.” 1988. Web. 22 Jan 2021.
Vancouver:
McFadden MP. Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle. [Internet] [Masters thesis]. Virginia Tech; 1988. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/43050.
Council of Science Editors:
McFadden MP. Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle. [Masters Thesis]. Virginia Tech; 1988. Available from: http://hdl.handle.net/10919/43050
Virginia Tech
2.
Wilson, Lawriston A. II.
Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology.
Degree: MS, Animal and Poultry Sciences, 1996, Virginia Tech
URL: http://hdl.handle.net/10919/36730
► An expert system to predict the fertility of beef heifers was developed using the A.I. Toolkit KAPPA-PC 2.33. The knowledge base was developed from scientific…
(more)
▼ An expert system to predict the fertility of beef heifers was developed using the A.I. Toolkit KAPPA-PC 2.33. The knowledge base was developed from scientific literature and from a beef cattle reproduction expert. The expert system computes an evaluation age, age both at the start and end of the breeding season, and weight per day of age to classify a heifer as having either a 3LOW2, 3GOOD2, or 3EXCELLENT2 likelihood of conception. The expert system summarizes the information that is entered into the computer and creates a text file of the summary. It also gives explanations for every prediction to help identify and alleviate any problem areas that may affect a heifer1s ability to reproduce. The program requires an IBM compatible computer installed with Windows 3.13 or greater. From simulated data for purebred or crossbred British cattle, there was 72% prediction agreement between the expert system and the expert. From analysis of historical data of Hereford-Angus crossbred cattle, heifers categorized as 3LOW2 and 3GOOD2 had significantly higher observed pregnancy rates than expected for each category. There was no significant difference between observed and expected pregnancy rates for heifers in the 3EXCELLENT2 category. Pregnancy rates for post-weaning and pre-breeding evaluations for the 3LOW2 heifers were found to be lower from the combined 3GOOD2 and 3EXCELLENT2 heifers at P=.03 and P=.06 respectively. Observed successful calving rates for heifers categorized as 3LOW2, 3GOOD2, and 3EXCELLENT2 did not differ significantly from the expected calving rates for each category.
Advisors/Committee Members: Hohenboken, William D. (committeechair), Beal, Wilfred E. (committee member), Heatwole, Conrad D. (committee member).
Subjects/Keywords: artificial intelligence; beef cattle; biological type; reproduction
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APA (6th Edition):
Wilson, L. A. I. (1996). Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/36730
Chicago Manual of Style (16th Edition):
Wilson, Lawriston A II. “Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology.” 1996. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/36730.
MLA Handbook (7th Edition):
Wilson, Lawriston A II. “Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology.” 1996. Web. 22 Jan 2021.
Vancouver:
Wilson LAI. Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology. [Internet] [Masters thesis]. Virginia Tech; 1996. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/36730.
Council of Science Editors:
Wilson LAI. Prediction of Fertility of Virginia Beef Heifers Using Expert Systems Technology. [Masters Thesis]. Virginia Tech; 1996. Available from: http://hdl.handle.net/10919/36730
Virginia Tech
3.
Jousan, Frank Dean.
Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability.
Degree: MS, Animal and Poultry Sciences, 2002, Virginia Tech
URL: http://hdl.handle.net/10919/33788
► High levels of dietary protein may be detrimental to reproductive performance in cattle. The objective of Exp. 1 was to determine the effects of differences…
(more)
▼ High levels of dietary protein may be detrimental to reproductive performance in cattle. The objective of Exp. 1 was to determine the effects of differences in dietary protein on the production and quality of bovine embryos collected from superovulated donors. Angus cows were randomly assigned to receive one of three experimental diets: a daily ration of 5.7 kg poultry litter,
2.0 kg hay, 3.1 kg corn, and 0.5 kg peanut hulls (LITTER; n = 15); a daily ration of 6.2 kg peanut hulls, 2.2 kg soybean meal, 2.0 kg hay, 0.5 kg corn, and 0.4 kg dicalcium phosphate (SBM; n = 15); or a daily ration of 6.2 kg peanut hulls, 2.0 kg hay, and 3.1 kg corn (CON; n = 19). Diets differed in the amount of total, soluble and degradable protein, but were comparable in energy. After 30 d on the diets, all cows were treated to induce superovulation (28.8 mg FSH/cow, Folltropin) and synchronize estrus. After the detection of estrus each cow was inseminated with semen from one of four Holstein bulls. Embryos were collected 7 d after estrus and evaluated for quality (according to the International Embryo Transfer Society (IETS) standards) and stage of development. Prior to treatment to induce superovulation, blood samples were collected 6 h after feeding. Samples were analyzed to assess dietary effects on plasma urea nitrogen (PUN). Mean levels of PUN were higher
(P < 0.01) in cows fed the LITTER or SBM diet
(16.3 mg/dL, LITTER; 21.8 mg/dL, SBM; 9.7 mg/dL, CON) than in cows fed the CON diet. Additionally, concentration of PUN was higher in cows fed SBM than in those fed LITTER (P < 0.01). An average of 9.2 transferable embryos (Grade 1, 2 and 3) was collected from each cow and there were no significant differences in the number of transferable embryos collected among groups
(9.2, LITTER; 9.3, SBM; 9.1, CON). The number of degenerate embryos or unfertilized ova did not differ among dietary groups. High-protein diets elevated PUN, but did not affect the number or quality of embryos collected from superovulated donors.
Cryopreservation of bovine embryos is an important aspect of a successful embryo transfer program. The objective of Exp. 2 was to evaluate the post-thaw viability of bovine embryos collected in Exp. 1 in an in vitro culture system after the embryos had been held at room temperature or refrigerated for 2 to 12 h prior to freezing. Upon embryo recovery, each embryo was randomly assigned to be placed in holding media for 2, 6 or 12 h prior to freezing. During this interval, one-half of the embryos were maintained in a refrigerated environment (5 °C), while the remaining half of the embryos were held at room temperature (20.5 to
22 °C) until freezing. Immediately prior to freezing, embryos were removed from the holding media, transferred to a well containing ethylene glycol (10%) in ovum culture media and loaded individually into a 0.25-mL plastic straw. Straws were then placed in a freezer unit (-6 °C) and seeded to induce ice crystal formation through all columns of the straw. The temperature of the…
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Gwazdauskas, Francis C. (committee member), Knight, James W. (committee member).
Subjects/Keywords: Superovulation; Bovine; Embryo; Dietary Protein; Cryopreservation
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APA (6th Edition):
Jousan, F. D. (2002). Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33788
Chicago Manual of Style (16th Edition):
Jousan, Frank Dean. “Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability.” 2002. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/33788.
MLA Handbook (7th Edition):
Jousan, Frank Dean. “Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability.” 2002. Web. 22 Jan 2021.
Vancouver:
Jousan FD. Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability. [Internet] [Masters thesis]. Virginia Tech; 2002. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/33788.
Council of Science Editors:
Jousan FD. Effects of Differences in Dietary Protein and Varying the Interval from Collection of Bovine Embryos to Freezing on Embryo Quality and Viability. [Masters Thesis]. Virginia Tech; 2002. Available from: http://hdl.handle.net/10919/33788
Virginia Tech
4.
Faber, Eric G.
Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate.
Degree: MS, Animal and Poultry Sciences, 1995, Virginia Tech
URL: http://hdl.handle.net/10919/45059
► The objective of this experiment was to determine whether norgestomet implant insertion following melengestrol acetate (MGA) administration altered LH pulse frequency and follicular dynamics.…
(more)
▼ The objective of this experiment was to determine whether norgestomet implant
insertion following melengestrol acetate (MGA) administration altered LH pulse
frequency and follicular dynamics. Multiparous Angus cows were randomly assigned to
receive MGA (.5 mg*cow
-l*d
-l ; MGA; n = 14) for 18 d or to receive MGA (.5 mg*cow·
-l
l*d
-l; MGA-N; n = 11) for 15 d and a norgestomet implant for 4 d beginning on d 15.
Ultrasound was used to record images of each ovary in cows beginning on d 8 of MGA
administration. On d 16, serial blood samples were collected from all cows in replicate
one (MGA, n=6; MGA-N, n=6) for quantification ofLH pulse frequency. A persistent,
dominant follicle was identified in all cows on d 8 ofMGA administration. Forty-three
percent and 64% (P > .10) of MGA and MGA-N cows, respectively, initiated a new
wave of follicular development during treatment that was the source of the ovulatory
follicle. Pulse frequency of LH did not differ between MGA and MGA-N cows or
between cows that ovulated a persistent (PERSIST) follicle and those that ovulated a
follicle from a new follicular wave (NEW). Growth rate of the ovulatory follicle for the
7 d preceding ovulation was greater in PERSIST than in NEW cows (P < .01).
Diameter of the owlatory follicle on the day preceding ovulation was greater in
PERSIST cows than in NEW cows (P < .01). In conclusion, MGA administration
caused a persistent follicle to develop, but that follicle was unable to be regressed
consistently by supplemental norgestomet administration.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Lewis, Gregory S. (committee member), Saacke, Richard G. (committee member).
Subjects/Keywords: follicles; LD5655.V855 1995.F334
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APA (6th Edition):
Faber, E. G. (1995). Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/45059
Chicago Manual of Style (16th Edition):
Faber, Eric G. “Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate.” 1995. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/45059.
MLA Handbook (7th Edition):
Faber, Eric G. “Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate.” 1995. Web. 22 Jan 2021.
Vancouver:
Faber EG. Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate. [Internet] [Masters thesis]. Virginia Tech; 1995. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/45059.
Council of Science Editors:
Faber EG. Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate. [Masters Thesis]. Virginia Tech; 1995. Available from: http://hdl.handle.net/10919/45059
Virginia Tech
5.
Matson, Kimberly Monica.
The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers.
Degree: MS, Animal and Poultry Sciences, 2004, Virginia Tech
URL: http://hdl.handle.net/10919/33186
► The objectives of this study were to determine the effects of handling peri-puberal heifers for 2 h each week on in-chute behavior, isolation behavior, and…
(more)
▼ The objectives of this study were to determine the effects of handling peri-puberal heifers for 2 h each week on in-chute behavior, isolation behavior, and the time required for each heifer to leave the testing area; and to determine if the location of the facial hair whorl was associated with any of the behavior scores or social dominance order. Crossbred beef heifers (n = 146) were assigned to be walked through, sorted and moved through a chute for 2 hr each wk for 20 wk (HANDLED) or allowed to remain on pasture unless handling was required to treat an injury or disease (CONTROL). In-chute behavior, isolation behavior and exit times were observed and scored at the beginning (0 wk), middle (10 wk) and end of the experiment (20 wk). The facial hair whorl on each heifer was classified as being high (above the eyes), middle (between the eyes), or low (below the eyes). At the end of the experiment pairs of heifers in the HANDLED group competed for a feed source and a social dominance order was estimated. Weekly handling decreased in-chute behavior scores of heifers with facial hair whorl positions classified as medium or low, but not in heifers that exhibited a hair whorl high on their face. Cattle in the HANDLED treatment group which had an initial isolation score of 2 or 3 had the greatest improvement in temperament over the entire experiment when compared to CONTROL animals with the same initial isolation score. The calmest heifers were not negatively affected by the handling, while the most agitated animals in the HANDLED had a similar overall change in isolation score as those animals in the
CONTROL group. This indicates that while weekly handling improved the temperament and behavior of heifers with intermediate temperament rating at the outset of the experiment, weekly handling seemed unnecessary for the calmest heifers and did not have a beneficial effect on the heifers rated as the most nervous and agitated at the beginning of the experiment. Social dominance rankings were positively correlated (P < 0.10) with final in-chute behavior scores, but not with the other behavior scores or heifer body weight. Cattle with the hair whorls in the middle of the forehead had higher mean social dominant rank than those with hair whorls higher or lower on the face (P < 0.03). Overall, the results of this experiment indicate that behavior testing can reveal differences in the temperament of heifers and that, other than the most nervous and agitated heifers; repeated handling could serve to improve the temperament of the animals.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Hall, John B. (committee member), Barnes, Michael A. (committee member).
Subjects/Keywords: facial hair whorl; behavior; temperament; beef heifer; social dominance
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APA (6th Edition):
Matson, K. M. (2004). The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33186
Chicago Manual of Style (16th Edition):
Matson, Kimberly Monica. “The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers.” 2004. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/33186.
MLA Handbook (7th Edition):
Matson, Kimberly Monica. “The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers.” 2004. Web. 22 Jan 2021.
Vancouver:
Matson KM. The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers. [Internet] [Masters thesis]. Virginia Tech; 2004. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/33186.
Council of Science Editors:
Matson KM. The effect of weekly handling on the temperament of peri-puberal crossbred beef heifers. [Masters Thesis]. Virginia Tech; 2004. Available from: http://hdl.handle.net/10919/33186
Virginia Tech
6.
Clarke, Linda Sue.
Breed group effects on pregnancy rate and ewe performance in different seasons of the year.
Degree: MS, Animal Science, 1985, Virginia Tech
URL: http://hdl.handle.net/10919/53062
► Thirty-one Dorset (D), 24 Finnish Landrace (F), 35 Barbados Blackbelly x Dorset (BD), 10 Dorset x Finn (F), 24 Finn x Dorset (FD) and 35…
(more)
▼ Thirty-one Dorset (D), 24 Finnish Landrace (F), 35 Barbados Blackbelly x Dorset (BD), 10 Dorset x Finn (F), 24 Finn x Dorset (FD) and 35 grade Rambouillet (R) ewes were exposed to rams in various seasons. Ewes were born in 1979 or 1980; no R ewes were born in 1980. Ewes were bred in April, 1980 (APR80); November, 1980 (NOV80); August, 1981 (AUG81); May, 1982 (MAY82); and April, 1983 (APR83). Ewes born in 1980 entered the study in NOV80. The analytical model used to describe ewe performance included effects of ewe birth year (EBY), breed/EBY, season/EBY, breed x season/EBY and ewe (random).
Advisors/Committee Members: Notter, David R. (committeechair), McCarthy, F. D. (committee member), Swiger, Louis Andre (committee member), Beal, Wilfred E. (committee member).
Subjects/Keywords: LD5655.V855 1985.C527; Ewes – Reproduction; Ewes – Breeding; Ewes – Experiments
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APA (6th Edition):
Clarke, L. S. (1985). Breed group effects on pregnancy rate and ewe performance in different seasons of the year. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/53062
Chicago Manual of Style (16th Edition):
Clarke, Linda Sue. “Breed group effects on pregnancy rate and ewe performance in different seasons of the year.” 1985. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/53062.
MLA Handbook (7th Edition):
Clarke, Linda Sue. “Breed group effects on pregnancy rate and ewe performance in different seasons of the year.” 1985. Web. 22 Jan 2021.
Vancouver:
Clarke LS. Breed group effects on pregnancy rate and ewe performance in different seasons of the year. [Internet] [Masters thesis]. Virginia Tech; 1985. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/53062.
Council of Science Editors:
Clarke LS. Breed group effects on pregnancy rate and ewe performance in different seasons of the year. [Masters Thesis]. Virginia Tech; 1985. Available from: http://hdl.handle.net/10919/53062
Virginia Tech
7.
Horsley, Brandon Ryan.
Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate.
Degree: MS, Animal and Poultry Sciences, 2004, Virginia Tech
URL: http://hdl.handle.net/10919/10124
► We previously reported that ovulation rate, but not pregnancy rate or litter size at d 30 post-mating, was enhanced by gonadotropin treatment (P.G. 600; Intervet…
(more)
▼ We previously reported that ovulation rate, but not pregnancy rate or litter size at d 30 post-mating, was enhanced by gonadotropin treatment (P.G. 600; Intervet America Inc., Millsboro, DE) in gilts fed a progestin (Regu-mate; Intervet America Inc.) compared with gilts receiving progestin alone. We hypothesized that P.G. 600 altered the timing of ovulation, therefore mating gilts 12 and 24 h after first detection of estrus, as is common in the swine industry, may not have been the most appropriate breeding regimen. The objective of this study was to determine the effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate. Randomly cycling, crossbred gilts (5.5 m of age, 117 kg BW, and 14.7 mm BF) were fed a diet containing Regu-mate to provide 15 mg/d for 18 d. Twenty-four h after Regu-mate withdrawal, gilts received i.m. P.G. 600 (n = 25) or saline (n = 25). Gilts were checked for estrus at 8 h intervals. After first detection of estrus, trans-rectal ultrasonography was performed at 8 h intervals to determine the time of ovulation. Gilts were killed 9 to 11 d after the onset of estrus to determine ovulation rate. All gilts displayed estrus by 7 d after treatment with P.G. 600 or saline. Compared with saline, P.G. 600 increased (P = 0.07) ovulation rate (14.8 + 1.1 vs. 17.5 + 1.0, respectively). The intervals from injection-to-estrus (98.4 + 2.7 vs. 110.9 + 2.7 h; P < 0.01) and injection-to-ovulation (128.6 + 2.8 vs. 141.9 + 3.2 h; P < 0.01) were decreased in gilts treated with P.G. 600 compared with gilts treated with saline. Estrus duration (54.4 + 2.3 vs. 53.7 + 2.5 h; P = 0.83), estrus-to-ovulation (30.2 + 2.0 vs. 31.7 + 2.2 h; P = 0.62) and time of ovulation as a percentage of duration of estrus (55.8 + 2.7 vs. 57.5 + 3.0%; P = 0.67) were similar for the P.G. 600 and saline-injected gilts, respectively. In summary, P.G. 600 advanced the onset of estrus and ovulation following termination of Regu-mate treatment and increased ovulation rate. However, treatment of gilts with P.G. 600 had no effect on the timing of ovulation relative to the onset of estrus.
Advisors/Committee Members: Estienne, Mark J. (committeechair), Beal, Wilfred E. (committee member), Knight, James W. (committee member), Harper, Allen F. (committee member).
Subjects/Keywords: P.G. 600; Regu-mate; gilt; estrus
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APA (6th Edition):
Horsley, B. R. (2004). Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/10124
Chicago Manual of Style (16th Edition):
Horsley, Brandon Ryan. “Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate.” 2004. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/10124.
MLA Handbook (7th Edition):
Horsley, Brandon Ryan. “Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate.” 2004. Web. 22 Jan 2021.
Vancouver:
Horsley BR. Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate. [Internet] [Masters thesis]. Virginia Tech; 2004. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/10124.
Council of Science Editors:
Horsley BR. Effect of P.G. 600 on the timing of ovulation in gilts treated with Regu-mate. [Masters Thesis]. Virginia Tech; 2004. Available from: http://hdl.handle.net/10919/10124
Virginia Tech
8.
Utt, Matthew Douglas.
The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle.
Degree: MS, Animal and Poultry Sciences, 2002, Virginia Tech
URL: http://hdl.handle.net/10919/33769
► The objective of this experiment was to examine the effects of varying the interval from follicular wave emergence to progestin removal on follicular dynamics and…
(more)
▼ The objective of this experiment was to examine the effects of varying the interval from follicular wave emergence to progestin removal on follicular dynamics and the synchrony of estrus. The experimental design was a 2x2x2 factorial with GnRH or estradiol-17 beta (E2) + progesterone (P4), controlled internal drug-releasing device (CIDR) treatment duration, and PG or saline treatment as main effects. Cycling, Angus cows (n=49), on d 6 to 8 of the estrous cycle, were randomly assigned to receive a CIDR treatment for 7 or 9 d. Approximately half of the cows from each CIDR group received either GnRH (100 mcg) or E2+P4 (1 mg E2 + 100 mg P4) at CIDR insertion. Cows in GnRH or E2+P4 groups were further divided into those that received PG (37.5 mg) or saline at CIDR insertion. All cows received PG (25 mg) 1 d prior to CIDR removal. The interval from follicular wave emergence to CIDR removal was longer for cows treated with GnRH (6.6 d) or a CIDR for 9 d (6.5 d) compared to those treated with E2+P4 (4.7 d) or a 7-d CIDR (4.8 d) (P < 0.05). Cows treated with PG or GnRH at CIDR insertion or a 9-d CIDR had a larger dominant follicle (DF) at CIDR removal than those treated with saline, E2+P4, or a 7-d CIDR. (P < 0.07). Altering the interval from wave emergence to progestin removal created differences in size of the DF at CIDR removal but did not affect the synchrony of estrus.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Saacke, Richard G. (committee member), Estienne, Mark J. (committee member), Nebel, Raymond L. (committee member).
Subjects/Keywords: GnRH; estrus synchronization; estradiol; follicle; progestin
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APA (6th Edition):
Utt, M. D. (2002). The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33769
Chicago Manual of Style (16th Edition):
Utt, Matthew Douglas. “The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle.” 2002. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/33769.
MLA Handbook (7th Edition):
Utt, Matthew Douglas. “The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle.” 2002. Web. 22 Jan 2021.
Vancouver:
Utt MD. The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle. [Internet] [Masters thesis]. Virginia Tech; 2002. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/33769.
Council of Science Editors:
Utt MD. The effects of varying the interval from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchrony of estrus in beef cattle. [Masters Thesis]. Virginia Tech; 2002. Available from: http://hdl.handle.net/10919/33769
Virginia Tech
9.
Blythe, William G.
Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes.
Degree: MS, Fisheries and Wildlife Sciences, 1992, Virginia Tech
URL: http://hdl.handle.net/10919/42948
► This thesis was partitioned into three studies. In the first study, striped bass, Morone saxatilis, (n = 16) were monitored over a 13 month period…
(more)
▼ This thesis was partitioned into three studies. In the first study, striped bass, Morone saxatilis, (n = 16) were monitored over a 13 month period to examine the efficacy of ultrasound to determine sex and to monitor sexual maturation. Four observers reviewed all ultrasound images (n = 208) of striped bass and were able to sex male and female striped bass with 99 and 95% accuracy, respectively throughout an annual reproductive cycle. Egg diameter was highly correlated with average (r = 0.89) and maximum (r=0.92) ovarian diameter as measured by ultrasound. Spenniating males exhibited larger maximum testicular diameters (23.5 mm) than non-spermiating males (13.1 mm). Fully mature female and male striped bass exhibited maximum ovarian diameters > 30 mm and testicular diameters > 20 mm as measured by ultrasound. The results of this study indicate that ultrasound is an effective and non-invasive method that aquaculturists can use to quickly scan, sex, and assess the sexual maturation of adult male and female striped bass year-round.
In the second study, photothennal manipulation was used to induce spawning out-of season and to increase the frequency of spawning in striped bass, Morone saxatilis. Forty adult striped bass, held in five environmental chambers, were exposed to compressed 6- and 9- month cycles and a 12-month reference cycle. Maximum egg diameters increased with cycle length, averaging 845 urn, 946 urn, and 1,073 um for females held on the 6-, 9-, and 12-month cycles,respectively. Females held on the 6-month cycle had smaller ovarian diameters (19.6 mm) than those held on the 9-month (27.4 mm) and 12-month (24.5 mm) cycles. Ovary diameter was highly correlated with egg diameter (r = 0.91). Spawning success (percent of females spawning) increased with cycle length, averaging 38%, 86%, and 100% in the 6-, 9-, and 12-month cycles, respectively. However, no differences in latent times, fecundity, or fertility were detected between cycles or between tank-spawned and strip-spawned females. Males held on the 6-month cycle had smaller testicular diameters (16.2 mm) than those held on 9-month (23.6 mm) and 12-month (19.2 mm) cycles. Testicular diameter ofspenniating males (15.7 mm) was significantly larger than that ofnon-spenniating males (6.9 rnrn) in all cycles. Mortality increased with cycle length, averaging 28%, 38%, and 88% for fish held on the 6-, 9-, and 12-month cycles, respectively. Maturation and spawning were advanced by five and three months for fish held in the 6- and 9-month cycles, respectively when compared to a natural 12-month reference cycle. Fish held on the 6-month cycle matured twice within a year. However, the relatively low number of spawning females and diminished egg, ovarian, and testicular diameter of fish held on the 6-month cycle suggest that an abbreviated cycle length « 9 months) may inhibit maturation and constrain spawning success.
Advisors/Committee Members: Helfrich, Louis A. (committeechair), Beal, Wilfred E. (committee member), Hallerman, Eric M. (committee member), Heath, Alan G. (committee member).
Subjects/Keywords: Striped bass; LD5655.V855 1992.B597
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APA (6th Edition):
Blythe, W. G. (1992). Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/42948
Chicago Manual of Style (16th Edition):
Blythe, William G. “Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes.” 1992. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/42948.
MLA Handbook (7th Edition):
Blythe, William G. “Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes.” 1992. Web. 22 Jan 2021.
Vancouver:
Blythe WG. Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes. [Internet] [Masters thesis]. Virginia Tech; 1992. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/42948.
Council of Science Editors:
Blythe WG. Induced maturation and spawning of striped bass, Morone saxatilis, exposed to 6-, 9-, and 12-month photothermal regimes. [Masters Thesis]. Virginia Tech; 1992. Available from: http://hdl.handle.net/10919/42948
Virginia Tech
10.
Smith, James Joseph.
An investigation into hormonal regulation of ovine mammary gland growth during pregnancy.
Degree: MS, Dairy Science, 1985, Virginia Tech
URL: http://hdl.handle.net/10919/41561
► Prepartum, multiparous ewes were randomly assigned to experimental groups and sacrificed at 50(n=5), SO(n=4),115(n=5), and 140(n=4) days of gestation. Serum harvested the week prior to…
(more)
▼ Prepartum, multiparous ewes were randomly assigned to experimental groups and sacrificed at 50(n=5), SO(n=4),115(n=5), and 140(n=4) days of gestation. Serum harvested the week prior to slaughter was assayed for progesterone (PG), prolactin (PRL) and growth hormone (GH) concentrations. Mammary tissue obtained at slaughter was assayed for receptor concentrations of progesterone (PGr), prolactin (PRLr) and insulin (Ir). Quantitative biochemical, histological and autoradiographical analyses were used to measure mammary gland growth and indicated no significant glandular growth occurs prior to 8O days of gestation. However, a major phase of parenchymal growth occurred between 8O and 115 days which coincided with significant increases in PG, PGr and PRLr concentrations. Parenchymal growth continued further into late pregnancy. GH and Ir concentrations did not change significantly during pregnancy and were not strongly correlated to growth measurements. These results suggest that mammary gland growth is receptor-mediated and direct or indirect regulation of PGr and PRLr is primarily responsible for the observed growth phenomenon.
Advisors/Committee Members: Akers, Robert Michael (committeechair), Gwazdauskas, Francis C. (committee member), Beal, Wilfred E. (committee member), White, John M. (committee member).
Subjects/Keywords: Mammary glands; LD5655.V855 1985.S657
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APA (6th Edition):
Smith, J. J. (1985). An investigation into hormonal regulation of ovine mammary gland growth during pregnancy. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/41561
Chicago Manual of Style (16th Edition):
Smith, James Joseph. “An investigation into hormonal regulation of ovine mammary gland growth during pregnancy.” 1985. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/41561.
MLA Handbook (7th Edition):
Smith, James Joseph. “An investigation into hormonal regulation of ovine mammary gland growth during pregnancy.” 1985. Web. 22 Jan 2021.
Vancouver:
Smith JJ. An investigation into hormonal regulation of ovine mammary gland growth during pregnancy. [Internet] [Masters thesis]. Virginia Tech; 1985. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/41561.
Council of Science Editors:
Smith JJ. An investigation into hormonal regulation of ovine mammary gland growth during pregnancy. [Masters Thesis]. Virginia Tech; 1985. Available from: http://hdl.handle.net/10919/41561
Virginia Tech
11.
Kearnan, Jeffrey Mark.
Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows.
Degree: MS, Animal Science (Reproductive Physiology), 1991, Virginia Tech
URL: http://hdl.handle.net/10919/41535
► The purpose of this study was to investigate the effect of prepartum and postpartum nutrition on milk production of commercial beef cows. Forty-three Angus…
(more)
▼ The purpose of this study was to investigate the effect of prepartum
and postpartum nutrition on milk production of commercial beef cows.
Forty-three Angus or Angus X Holstein females, ranging in age from 2 to 6
yr, were randomly assigned by age and percentage Holstein within age to
one of two prepartum grazing treatments (PRE). All females, regardless of
PRE, were assigned at calving to receive the same post-calving nutritional
energy. Females were assigned at calving by age, percentage Holstein
within age, prepartum nutritional treatment and calving date to one of two
milking groups. Milk weight (grams), milk composition (fat, protein, lactose,
solids-not-fat, somatic cell count), dam body condition score (1 to 9), dam
body weight, dam backfat thickness, loineye area, calf weaning weight and
postpartum interval to estrus were all evaluated. Milk removal occurred
biweekly by vacuum milking machine after intravenous injection of 20 IU of
oxytocin. Samples were weighed and taken for milk analysis and
determination of milk components. At 76± 10 d post-calving, females were
assigned by age, percentage Holstein within age, prepartum nutritional
treatment, and calving date to receive one of two postpartum nutritional
treatments (POST). Females continued to be milked by machine biweekly
until calves were weaned 199 ± 10 d. Differences in grazing level prior to
calving significantly effected calf birth weights, with dams on the prepartum
restricted grazing being lighter in weight at birth, 36.69 ± .68 and
38.95 ± .81 kg for PRE-L and PRE-H groups, respectively, however grazing
differences did not effect calf weaning weight, calf gain or calf average daily
gain. POST nutritional treatments significantly effected all calf performance
traits with 37.10±.70, 38.54±.88; 196.89±4.9, 213.33±6.2;
159.79±4.8, 174.78±6.0; .809±.024, .888±.030; for birth weight,
weaning weight, calf gain and calf average daily gain from cows on the
POST -M or POST -H nutritional treatments, respectively. Pre-partum
nutrition effected milk production (P < .001) with dams from the PRE-L
grazing group producing less milk, 5622 ± 75 vs 6888 ±80 g. Postpartum
energy also effected milk production with dams on the POST-H energy level
producing more milk than dams from the POST-M group. Percentages of
fat, protein, lactose and solids-not-fat were not different between the
prepartum or postpartum diets (P>. 10). Somatic cell count was negatively
correlated with dam milk production (P< .03). Postpartum interval to estrus
was shorter for the PRE-L group than for the PRE-H, 43 ± 4 vs 53 ± 4 d.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Eller, A. L. Jr. (committee member), Wahlberg, Mark L. (committee member), Frahm, Richard R. (committee member).
Subjects/Keywords: Puerperium; beef cattle; milk production; weaning weight; LD5655.V855 1991.K429
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APA (6th Edition):
Kearnan, J. M. (1991). Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/41535
Chicago Manual of Style (16th Edition):
Kearnan, Jeffrey Mark. “Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows.” 1991. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/41535.
MLA Handbook (7th Edition):
Kearnan, Jeffrey Mark. “Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows.” 1991. Web. 22 Jan 2021.
Vancouver:
Kearnan JM. Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows. [Internet] [Masters thesis]. Virginia Tech; 1991. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/41535.
Council of Science Editors:
Kearnan JM. Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows. [Masters Thesis]. Virginia Tech; 1991. Available from: http://hdl.handle.net/10919/41535
Virginia Tech
12.
Nugent, Russell A., III.
Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes.
Degree: MS, Animal Science, 1987, Virginia Tech
URL: http://hdl.handle.net/10919/44057
► The present studies were conducted to check the effects of acute ram introduction into a flock of anestrus ewes in Virginia. Ewes were bled via…
(more)
▼ The present studies were conducted to check the effects
of acute ram introduction into a flock of anestrus ewes in
Virginia. Ewes were bled via jugular venipuncture twice
weekly and serum samples were radioimmunoassayed for
progesterone (P4) content as an indicator of estrous activity.
All rams were fitted with crayon equipped marking harnesses
for use as an indicator of mating behavior in ewes.
The first study tested the effects of introduction of
vasectomized rams into a flock: of' 50 Dorset (D) and 50
Hampshire (H) purebred ewes in either May or June. More D
ewes ovulated (96% vs 72% for H ewes) and mated (80% vs 20%
for H ewes) in May. Of ewes which mated in May 65% D but no
H ewes continued to cycle in June after removal of rams. Of
ewes exposed to rams in June no difference among breeds was
observed in percentage of ewes ovulating but more D ewes
(72%) mated than H ewes (44%). Twenty-four percent of D but
no H ewes cycled continuously throughout the 68 d or the
study. Lambing date significantly affected mating behavior
in H but not D ewes.
The second study tested the effects of ram breed on incidence
of mating and subsequent lambing in Rambouillet x
Q Suffollk ewes In June and July of 1984 and 1985. Ewes were
Q pre-exposed to either confined Suffolk (S) or Dorset (D)
Q yearling rams or no (N) ram for 2 wk prior to breeding by
Q either S or D rams. Lambing date was significantly affected
by breeding treatment in 1984 and by pre-exposure treatment
in 1985. Sixty-three percent of the ewes lambed in 1984
while 65% lambed in 1985.
Advisors/Committee Members: Notter, David R. (committeechair), Beal, Wilfred E. (committee member), Siegel, Paul B. (committee member), Umberger, Steven H. (committee member).
Subjects/Keywords: Sheep; LD5655.V855 1987.N83
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APA (6th Edition):
Nugent, Russell A., I. (1987). Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/44057
Chicago Manual of Style (16th Edition):
Nugent, Russell A., III. “Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes.” 1987. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/44057.
MLA Handbook (7th Edition):
Nugent, Russell A., III. “Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes.” 1987. Web. 22 Jan 2021.
Vancouver:
Nugent, Russell A. I. Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes. [Internet] [Masters thesis]. Virginia Tech; 1987. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/44057.
Council of Science Editors:
Nugent, Russell A. I. Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes. [Masters Thesis]. Virginia Tech; 1987. Available from: http://hdl.handle.net/10919/44057
Virginia Tech
13.
Liles, Amanda Gail.
The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers.
Degree: MS, Animal and Poultry Sciences, 2008, Virginia Tech
URL: http://hdl.handle.net/10919/34684
► Recent efforts have improved synchronization systems that facilitate timed insemination in beef cattle. However, synchronization systems utilizing a single fixed-time artificial insemination (FTAI) frequently result…
(more)
▼ Recent efforts have improved synchronization systems that facilitate timed insemination in beef cattle. However, synchronization systems utilizing a single fixed-time artificial insemination (FTAI) frequently result in 25-40% non-pregnant heifers. The purpose of this study was to determine the effectiveness and define economic parameters of a FTAI resynchronization protocol in beef heifers after synchronization using a 5d CO-Synch + CIDR system. Estrus was synchronized in crossbred heifers (n=176) using 5 d CO-Synch + CIDR with FTAI at 72 h. After the initial AI, open heifers received either resynchronization (RS) or natural service (NS) return service treatments. The RS treatment was diagnosed for pregnancy 29 d after the initial AI, and all open heifers were resynchronized using the 5 d CO-Synch + CIDR with FTAI at 72 h. Heifers diagnosed pregnant following initial AI received no further treatment. Heifers in the NS treatment were exposed to fertile bulls from d 14 to d 66 following initial AI. Return to estrus data were collected using the Heat Watch Estrus Alert System. Total AI pregnancies tended to be higher (P=0.07) for RS (69.7%) than NS (56.5%) heifers. Overall pregnancy rate was greater for NS (89.4%) than for RS (69.7%) at the end of the breeding season (P < 0.01). The cost of RS was 128.63 and for NS was 82.50 per pregnancy. The expected average calf value per heifer exposed was 195.84 for RS treatment and 357.62 for NS treatment. This difference was attributed to the increased number of open heifers in the RS treatment. The resynchronization of estrus after the initial FTAI yielded a limited number of pregnancies in the breeding season in this study. However, the resynchronization program also cost more per pregnancy. Further investigation into resynchronization should focus on both biological and economic impacts.
Advisors/Committee Members: Greiner, Scott P. (committeechair), Barnes, Michael A. (committee member), Beal, Wilfred E. (committee member), Hall, John B. (committee member).
Subjects/Keywords: Beef; Heifer; Reproduction; Resynchronization; Economics
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APA (6th Edition):
Liles, A. G. (2008). The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34684
Chicago Manual of Style (16th Edition):
Liles, Amanda Gail. “The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers.” 2008. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/34684.
MLA Handbook (7th Edition):
Liles, Amanda Gail. “The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers.” 2008. Web. 22 Jan 2021.
Vancouver:
Liles AG. The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers. [Internet] [Masters thesis]. Virginia Tech; 2008. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/34684.
Council of Science Editors:
Liles AG. The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers. [Masters Thesis]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/34684
Virginia Tech
14.
DeJarnette, James Melton.
The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine.
Degree: MS, Dairy Science, 1990, Virginia Tech
URL: http://hdl.handle.net/10919/41929
Subjects/Keywords: Cattle; LD5655.V855 1990.D447
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APA (6th Edition):
DeJarnette, J. M. (1990). The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/41929
Chicago Manual of Style (16th Edition):
DeJarnette, James Melton. “The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine.” 1990. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/41929.
MLA Handbook (7th Edition):
DeJarnette, James Melton. “The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine.” 1990. Web. 22 Jan 2021.
Vancouver:
DeJarnette JM. The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine. [Internet] [Masters thesis]. Virginia Tech; 1990. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/41929.
Council of Science Editors:
DeJarnette JM. The effects of sperm dose, semen quality, and retrograde sperm blockage on accessory sperm number and embryo quality in the artificially inseminated bovine. [Masters Thesis]. Virginia Tech; 1990. Available from: http://hdl.handle.net/10919/41929
Virginia Tech
15.
Hopkins, Katherine Lee.
In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation.
Degree: MS, Animal Science, 1987, Virginia Tech
URL: http://hdl.handle.net/10919/45793
► The purpose of this investigation was to characterize the activities of three enzymes, aromatase, estrone (E1) sulfotransferase and E] sulfatase, in the porcine placenta…
(more)
▼ The purpose of this investigation was to characterize the activities of three
enzymes, aromatase, estrone (E1) sulfotransferase and
E] sulfatase, in the porcine
placenta and endometrium on d 30, 60 and 90 of gestation. These enzymes play key
roles in determining in utero concentrations of estrogens. Days 30, 60 and 90 were
chosen because previous investigations had determined that these were times of
substantial changes in in vitro estrogen production by the porcine placenta and
endometrium.
Advisors/Committee Members: Knight, James W. (committeechair), Beal, Wilfred E. (committee member), Notter, David R. (committee member), Frahm, Richard R. (committee member).
Subjects/Keywords: Swine; LD5655.V855 1987.H664
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APA (6th Edition):
Hopkins, K. L. (1987). In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/45793
Chicago Manual of Style (16th Edition):
Hopkins, Katherine Lee. “In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation.” 1987. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/45793.
MLA Handbook (7th Edition):
Hopkins, Katherine Lee. “In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation.” 1987. Web. 22 Jan 2021.
Vancouver:
Hopkins KL. In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation. [Internet] [Masters thesis]. Virginia Tech; 1987. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/45793.
Council of Science Editors:
Hopkins KL. In vitro characterization of aromatase, estrone sulfotransferase and estrone sulfatase activities in the porcine placenta and endometrium at 30, 60 and 90 days of gestation. [Masters Thesis]. Virginia Tech; 1987. Available from: http://hdl.handle.net/10919/45793
Virginia Tech
16.
Purcell, Scott Hudson.
Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle.
Degree: MS, Animal and Poultry Sciences, 2004, Virginia Tech
URL: http://hdl.handle.net/10919/9992
► The objectives of this study were to evaluate the effects of flunixin meglumine (FM), an inhibitor of PGF2a synthesis, administered at the time of embryo…
(more)
▼ The objectives of this study were to evaluate the effects of flunixin meglumine (FM), an inhibitor of PGF2a synthesis, administered at the time of embryo transfer (ET) and insertion of an intravaginal progesterone-releasing device (CIDR) at the time of ET on pregnancy rates (PR) and the resynchronization of estrus. Beef cows (n = 796) and heifers (n = 108) at three locations were assigned randomly within age to one of four groups in a 2 x 2 factorial arrangement of treatments with injection of FM (500 mg i.m.; Phoenix Scientific, St. Joseph, MO) 2 to 12 min prior to ET and insertion of a CIDR (1.38 g progesterone; Pfizer, New York, NY) for 13 d immediately following ET as main effects. Fresh or frozen embryos (Stage = 4 or 5; Grade = 1 or 2) were randomly assigned to be transferred to recipients on d 6 to 9 of the estrous cycle. At Location 2 a subset of fresh embryos were split and transferred as fresh half embryos (n = 192). Recipients at Location 2 only (n = 493) were observed for signs of return to estrus beginning 9 d after ET. Recipients that returned to estrus at Location 2 were either bred by AI 12 h after estrus or received an embryo 7 d after estrus. Pregnancy was diagnosed by ultrasonography. Pregnancy rates were analyzed using the LOGISTIC procedure of SAS. Pregnancy rates of split embryo recipients were analyzed separately using the same statistical procedure. Variation in the timing of the return to estrus was determined by an F-test for heterogeneity of variances. Following the initial ET, pregnancy rates of recipients receiving whole embryos were not affected by CIDR administration (P > 0.05; 65% with CIDR, 70% without CIDR), however, there was a significant FM x location interaction on PR (Location 1, 89 vs. 57%; Location 2, 69 vs. 64%; Location 3, 64 vs. 67% for FM vs. no FM, respectively). There was a significant CIDR x FM interaction on PR of recipients receiving split embryos. Pregnancy rates of split embryo recipients receiving CIDR treatment (54%) or FM treatment alone (41%) were less than controls (64%). However, recipients receiving both CIDR and FM had PR similar to controls (60%). The timing of the return to estrus was more synchronous (P < 0.01) for recipients fitted with a CIDR, but PR of recipients bred following a return to estrus did not differ in cows receiving or not receiving a CIDR (P > 0.13; 68 and 62%, respectively). Effects of FM on PR were location dependent and CIDR insertion at ET improved synchrony of the return to estrus.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Hall, John B. (committee member), McCann, Mark A. (committee member), Smith, S. Raymond (committee member).
Subjects/Keywords: Beef Cattle; Flunixin Meglumine; Embryo Transfer; CIDR
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APA (6th Edition):
Purcell, S. H. (2004). Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/9992
Chicago Manual of Style (16th Edition):
Purcell, Scott Hudson. “Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle.” 2004. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/9992.
MLA Handbook (7th Edition):
Purcell, Scott Hudson. “Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle.” 2004. Web. 22 Jan 2021.
Vancouver:
Purcell SH. Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle. [Internet] [Masters thesis]. Virginia Tech; 2004. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/9992.
Council of Science Editors:
Purcell SH. Effect Of A Cidr Insert And Flunixin Meglumine Administered At The Time Of Embryo Transfer On Pregnancy Rate And Resynchronization Of Estrus In Beef Cattle. [Masters Thesis]. Virginia Tech; 2004. Available from: http://hdl.handle.net/10919/9992
Virginia Tech
17.
Hall, Stacey J.
Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α.
Degree: MS, Animal Science (Physiology of Reproduction), 1991, Virginia Tech
URL: http://hdl.handle.net/10919/44229
► The objective of these experiments was to determine the effects of and/or interactions among estrous synchronization treatments, reproductive status, and stage of the estrous cycle…
(more)
▼ The objective of these experiments was to determine the effects of and/or interactions among estrous synchronization treatments, reproductive status, and stage of the estrous cycle on estrous response (ER), first service conception rates (CR), pregnancy rates (PR), and embryonic mortality (EM) after 25 d of gestation. Angus or Angus crossbred cattle (n=391) at two locations were assigned to receive either melengestrol acetate for 7 d (MGA-PGF; .5 mg/hd/d, n=136) or progesterone releasing intravaginal device for 7 d (PRID-PGF; n=139) or to serve as untreated controls (n=116). All animals in MGA and PRID treated groups coincidentally received 25 mg prostaglandin F₂α (PGF) on the final day of treatment. Real time, B-mode, ultrasound with a 7.5 mHz linear-array transducer was used to conduct three ovarian scans at 7-d intervals beginning 7 d prior to initiation of treatment. Jugular blood samples were collected at each scanning period. Serum was harvested and stored at 4°C until radioimmunoassayed for progesterone (P4). Serum P4 levels in conjunction with ovarian scans were used to determine cycling status and stage of the estrous cycle at initiation of treatment. Cattle treated with PRID-PGF exhibited a greater synchronized ER (P < .06) than MGA-treated cattle. Cycling animals had a greater ER than noncycling animals, regardless of treatment (P < .01). Anestrous postpartum cows and prepubertal heifers treated with PRID-PGF exhibited a greater ER (P < .05) within 7 d than either MGA-treated or untreated control animals. Conception rates of cattle treated with PRID-PGF beginning late (> Day 16) in the estrous cycle were improved over those of MGA-treated cattle (P < .13) at the same stage. Pregnancy rate at 21 d was higher in PRID-treated cattle than untreated controls (P < .01). Ultrasound scans for embryonic viability were conducted at 25, 45, and 65 d of gestation. Calving data was collected to characterize EM between 65 d and term. The majority of embryonic loss occurring after 25 d of pregnancy occurred before 45 d. Synchronization treatment had no effect on the extent of EM occurring after 25 d of gestation. Embryonic mortality occurring between d 45 and 65 (2%) and between d 65 and term (3%) when combined were similar in magnitude to EM occurring between 25 and 45 d of gestation (4.8%). In conclusion, PRID for 7 d combined with PGF was a superior synchronization treatment for the mixed group of cyclic and anestrous cattle.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Knight, James W. (committee member), Saacke, Richard G. (committee member), Wood, Cynthia M. (committee member).
Subjects/Keywords: Conception; LD5655.V855 1991.H346
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APA (6th Edition):
Hall, S. J. (1991). Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/44229
Chicago Manual of Style (16th Edition):
Hall, Stacey J. “Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α.” 1991. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/44229.
MLA Handbook (7th Edition):
Hall, Stacey J. “Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α.” 1991. Web. 22 Jan 2021.
Vancouver:
Hall SJ. Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α. [Internet] [Masters thesis]. Virginia Tech; 1991. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/44229.
Council of Science Editors:
Hall SJ. Synchronization of estrus, conception rate, and embryonic mortality in beef cattle following treatment with progesterone-releasing intravaginal devices or melengestrol acetate in conjunction with PGF₂α. [Masters Thesis]. Virginia Tech; 1991. Available from: http://hdl.handle.net/10919/44229
Virginia Tech
18.
Wuenschel, Jeffrey Carl Jr.
Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids.
Degree: MS, Animal and Poultry Sciences, 2006, Virginia Tech
URL: http://hdl.handle.net/10919/34958
► The objective of this study was to determine the effects of dietary supplementation of eicosapentanoic (EPA) and docosahexanoic acids (DHA) on reproduction in beef females.…
(more)
▼ The objective of this study was to determine the effects of dietary supplementation of eicosapentanoic (EPA) and docosahexanoic acids (DHA) on reproduction in beef females. In experiment 1, cows (n = 31) were individually fed rumen protected fish meal (FM) or no fish meal (C) supplements. Estrus was synchronized and ovulation induced on d 37. Ovarian follicular growth and diameter were determined by ultrasound on d 35 and d 37. Serum progesterone (P4) profiles were analyzed on d 37 through d 52. On d 52 cows were cannulated, primed with estradiol-17β at -240 min, and stimulated to release PGF2α by oxytocin injection at 0 min with blood sampled every 15 min from -30 min to 240 min. Supplement type did not affect (P > 0.05) follicular diameter, follicular growth or P4 concentrations. In cows fed FM, prostaglandin metabolite (PGFM) concentrations tended (P ≤ 0.10) to be reduced at 0, 30, and 60 min. In experiment 2, crossbred heifers (n = 214) received FM or C concentrates with corn silage from 30 d before estrous synchronization until 14 d after artificial insemination (AI). Serum fatty acid profiles were determined in five heifers from each group . Estrus detection and AI were conducted from d 37 through d 39. Dietary treatment increased (P < 0.05) EPA and DHA concentrations. Dietary treatment did not affect estrus response or AI conception rates and pregnancy rate. Supplementation of FM increased EPA and DHA concentrations but did not affect reproductive factors.
Advisors/Committee Members: Hall, John B. (committeechair), Beal, Wilfred E. (committee member), Knowlton, Katharine F. (committee member), Greiner, Scott P. (committee member).
Subjects/Keywords: Prostaglandin; Nutrition; Reproduction; Beef Cattle; Fatty Acids
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APA (6th Edition):
Wuenschel, J. C. J. (2006). Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34958
Chicago Manual of Style (16th Edition):
Wuenschel, Jeffrey Carl Jr. “Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids.” 2006. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/34958.
MLA Handbook (7th Edition):
Wuenschel, Jeffrey Carl Jr. “Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids.” 2006. Web. 22 Jan 2021.
Vancouver:
Wuenschel JCJ. Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids. [Internet] [Masters thesis]. Virginia Tech; 2006. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/34958.
Council of Science Editors:
Wuenschel JCJ. Effects of Feeding Supplemental Eicosapentanoic Acid and Docosahexanoic Acid to Beef Females on Reproductive Responses and Free Fatty Acids. [Masters Thesis]. Virginia Tech; 2006. Available from: http://hdl.handle.net/10919/34958
Virginia Tech
19.
Gibbons, John R.
Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection.
Degree: MS, Dairy Science, 1994, Virginia Tech
URL: http://hdl.handle.net/10919/46259
► Three experiments were conducted to determine an efficient method of obtaining oocytes from cows via ultrasound-guided transvaginal follicular aspiration. Transvaginal oocyte recovery combined with…
(more)
▼
Three experiments were conducted to determine an efficient method of obtaining
oocytes from cows via ultrasound-guided transvaginal follicular aspiration. Transvaginal
oocyte recovery combined with in vitro maturation, fertilization, and culture
(IVMlIVFIIVC) can produce pre-implantation stage bovine embryos and also supply a
source of ova for gene microinjection. In Experiment 1, once- (IX) vs. twice-weekly
(2X) oocyte recovery frequencies were compared. No differences in recovery per session
were observed (IX = 6.8 vs. 2X = 6.3 oocytes/session; p>O.1 0). However, the 2X group
generated more oocytes on a weekly basis (IX = 6.8 vs. 2X = 12.6 oocytes/week;
p<O.OS). In Experiment 2, in vitro embryo production was compared among the groups
aspirated once-weekly (1 X), twice-weekly (2X), and twice-weekly after receiving I5 mg
FSH (2XF). No differences existed among the aspiration groups in the proportion of
blastocysts produced following IVMIIVFIIVC (IX = 23.10/0, 2X = 26.1%, 2XF = 18.0%,
% viable). However, the 2X group generated more oocytes and embryos throughout the
experiment (2X = 83/318, 2XF = 38/211, IX = 58/2SI viable blastocyst/total oocytes;
p<O.O5) than the other groups. A higher proportion of 2X or 2XF generated embryos
were of excellent quality (2X = 60.2%, 2XF = 60.5%) compared to the IX group (37.9%)
In Experiment 3, in vitro embryo development rates were compared among oocytes from
follicular aspiration (TVFA) and oocytes derived from slaughterhouse ovaries (SHD).
Oocytes (65%) from both sources were subjected to pronuclear-microinjection of foreign
DNA while the remainder served as non-injected controls. Only control oocytes differed,
with TVF A-derived oocytes developing to blastocyst more successfully than SHD oocytes
(40.8% vs. 30.0olo~ p<0.05). Microinjected embryo development was similar between the
groups (TVFA 15.9%, vs. SHD = 12.8% viable blastocyst/total;) with the TVFA
oocytes holding a slight but non-significant numerical advantage (p>O.IO) In these
experiments, twice-weekly follicular aspiration without exogenous FSH, was the best
scheme of oocyte recovery. This program provided a source of consistent, high quality
oocytes that responded favorable to the IVMIIVFIIVC system and microinjection.
Advisors/Committee Members: Gwazdauskas, Francis C. (committeechair), Beal, Wilfred E. (committee member), Pearson, Ronald E. (committee member), Vinson, William E. (committee member).
Subjects/Keywords: Ovum.; LD5655.V855 1994.G533
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APA (6th Edition):
Gibbons, J. R. (1994). Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/46259
Chicago Manual of Style (16th Edition):
Gibbons, John R. “Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection.” 1994. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/46259.
MLA Handbook (7th Edition):
Gibbons, John R. “Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection.” 1994. Web. 22 Jan 2021.
Vancouver:
Gibbons JR. Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection. [Internet] [Masters thesis]. Virginia Tech; 1994. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/46259.
Council of Science Editors:
Gibbons JR. Ultrasound-guided transvaginal follicular aspiration to provide a source of bovine oocytes for gene microinjection. [Masters Thesis]. Virginia Tech; 1994. Available from: http://hdl.handle.net/10919/46259
Virginia Tech
20.
Custer, Edward E.
Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle.
Degree: PhD, Animal Science, 1992, Virginia Tech
URL: http://hdl.handle.net/10919/38836
Subjects/Keywords: Progestational hormones.; LD5655.V856 1992.C879
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APA (6th Edition):
Custer, E. E. (1992). Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/38836
Chicago Manual of Style (16th Edition):
Custer, Edward E. “Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle.” 1992. Doctoral Dissertation, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/38836.
MLA Handbook (7th Edition):
Custer, Edward E. “Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle.” 1992. Web. 22 Jan 2021.
Vancouver:
Custer EE. Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle. [Internet] [Doctoral dissertation]. Virginia Tech; 1992. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/38836.
Council of Science Editors:
Custer EE. Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17B concentrations and patterns of luteinizing hormone release during the bovine estrous cycle. [Doctoral Dissertation]. Virginia Tech; 1992. Available from: http://hdl.handle.net/10919/38836
Virginia Tech
21.
Barahona, Roberto G. Suazo.
Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content.
Degree: MS, Animal Science, 1989, Virginia Tech
URL: http://hdl.handle.net/10919/43288
► The purpose of this study was to investigate the effect of intrauterine position and its possibly resultant steroid differential on conceptus growth and steroid content…
(more)
▼ The purpose of this study was to investigate the effect of intrauterine position and its possibly resultant steroid differential on conceptus growth and steroid content in allantoic and amniotic fluid of pigs. six conceptus variables (placental weight, placental length, fetal weight, fetal length, allantoic fluid volume and amniotic fluid volume) and seven steroids (progesterone, androstenedione, dehydroepiandrosterone, dehydroepiandrosterone sulfate, testosterone, estrone and estrone sulfate) were evaluated. Four fetal positions were studied: females between females (f2F), females between males (fOF) , males between females (m2F) and males between males (mOF).
Fetuses examined from ovariectomized (OVX) pregnenolone (PS)-treated gilts showed differences in placental
weight, allantoic fluid estrone and androstenedione content and amniotic fluid androstenedione content as a result of intrauterine position. Fetuses from OVX gilts treated with either medroxyprogesterone acetate (MPA) I or progesterone (P4) showed differences in placental length due to intrauterine position. Allantoic and amniotic fluid content of any of the steroids studied from OVX MPA- and P4-treated gilts was not altered as a result of intrauterine position. Intrauterine position appears to have a definite influence on conceptus development and possibly on steroid content. However, discrepancies' of results among trials possibly as a result of differences in type and amount of exogenous precursor enable us to draw stronger conclusions on the intrauterine position effect.
Advisors/Committee Members: Beal, Wilfred E. (committeechair), Lewis, Gregory S. (committee member), Notter, David R. (committee member), Gwazdauskas, Francis C. (committee member), Frahm, Richard R. (committee member).
Subjects/Keywords: Swine; LD5655.V855 1989.B273
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APA (6th Edition):
Barahona, R. G. S. (1989). Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43288
Chicago Manual of Style (16th Edition):
Barahona, Roberto G Suazo. “Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content.” 1989. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/43288.
MLA Handbook (7th Edition):
Barahona, Roberto G Suazo. “Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content.” 1989. Web. 22 Jan 2021.
Vancouver:
Barahona RGS. Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content. [Internet] [Masters thesis]. Virginia Tech; 1989. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/43288.
Council of Science Editors:
Barahona RGS. Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content. [Masters Thesis]. Virginia Tech; 1989. Available from: http://hdl.handle.net/10919/43288
Virginia Tech
22.
Nadir, Sher.
Effect of seminal plasma on cryopreservation and function of bovine spermatozoa.
Degree: PhD, Animal Science, 1995, Virginia Tech
URL: http://hdl.handle.net/10919/39606
► This study was conducted to :1) determine the effect of seminal plasma (SP) on sperm viability parameters (estimated percent motile sperm, computer-aided percent motile sperm…
(more)
▼ This study was conducted to :1) determine the effect of seminal plasma (SP) on sperm viability parameters (estimated percent motile sperm, computer-aided percent motile sperm and percent intact acrosomes) and motion characteristics (average path velocity, VAP; curvilinear velocity, VCL; and straight line velocity, VSL) of cryopreserved ejaculated spermatozoa (Experiment 1) and cauda epididymal spermatozoa, both fresh and frozen (Experiment 2).2) determine the effect of additional SP on sperm transport in the female using cryopreserved ejaculated sperm (Experiment 3) or cryopreserved cauda epididymal sperm (Experiment 4). In Experiment I, addition of SP (1:1, v/v, post-thaw) did not affect (P> .05) viability parameters; however, all sperm motion characteristics were improved at 3 h of incubation (P < .05). In Experiment 2, addition of a normal complement of SP to cauda epididymal sperm significantly improved all motion characteristics and viability parameters except acrosomal integrity (P < .05) and semen freezing did not alter this effect. In Experiment 3 and 4, addition of SP to the inseminate did not affect the mean or median accessory sperm number (P> .05); however, in both experiments there was a trend toward increased median accessory sperm values for the SP-treated semen. In Experiment 3, mean ± SD and median accessory sperm values per embryo/ovum were 19.2± 36.9 and 2.5 for the control (n = 32); and 23.1 ± 71.6 and 6.5 for the treatment (n = 32). In Experiment 4, mean± SD and median accessory sperm values per embry%vum were 9.2± 16.7 and 1.0 for the control (n = 30); and 14.2± 21.2 and 3.5 for the treatment (n = 30). We conclude from these experiments that sperm motion characteristics but not viability parameters of ejaculated frozen-thawed semen are improved by additional SP (Experiment 1) and both motility and motion characteristics are modestly improved by a normal complement of SP added to cauda epididymal sperm (Experiment 2). This positive effect of SP on motility/motion characteristics may favor sperm transport, but not at a statistically significant level to be detected by accessory sperm number.
Advisors/Committee Members: Saacke, Richard G. (committeechair), Nebel, Raymond L. (committee member), Purswell, Beverly J. (committee member), Vinson, William E. (committee member), Beal, Wilfred E. (committee member).
Subjects/Keywords: LD5655.V856 1995.N335
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APA (6th Edition):
Nadir, S. (1995). Effect of seminal plasma on cryopreservation and function of bovine spermatozoa. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/39606
Chicago Manual of Style (16th Edition):
Nadir, Sher. “Effect of seminal plasma on cryopreservation and function of bovine spermatozoa.” 1995. Doctoral Dissertation, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/39606.
MLA Handbook (7th Edition):
Nadir, Sher. “Effect of seminal plasma on cryopreservation and function of bovine spermatozoa.” 1995. Web. 22 Jan 2021.
Vancouver:
Nadir S. Effect of seminal plasma on cryopreservation and function of bovine spermatozoa. [Internet] [Doctoral dissertation]. Virginia Tech; 1995. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/39606.
Council of Science Editors:
Nadir S. Effect of seminal plasma on cryopreservation and function of bovine spermatozoa. [Doctoral Dissertation]. Virginia Tech; 1995. Available from: http://hdl.handle.net/10919/39606
Virginia Tech
23.
Meacham, Nancy S.
Heritability estimates for calving date in Simmental cattle.
Degree: MS, Animal Science, 1987, Virginia Tech
URL: http://hdl.handle.net/10919/45782
► Variation among sires in daughters' reproductive performance was analyzed using data on 4,360 cows from nine herds obtained from the American Simmental Association. Cows…
(more)
▼ Variation among sires in daughters' reproductive
performance was analyzed using data on 4,360 cows from
nine herds obtained from the American Simmental Association.
Cows were required to have at least 50% Simmental
breeding, to have calved first at 2 yr of age and to have
been born and subsequently calved in the same herd and
season. Traits analyzed included first and second calving
dates, first calving interval and the percentage of cows
that returned to calve in the same season as 3-yr-olds.
Data were adjusted for effects of percentage Simmental and
I firstâ ca1f calving ease score.
Advisors/Committee Members: Notter, David R. (committeechair), Pearson, Ronald E. (committee member), Marlowe, Thomas J. (committee member), Beal, Wilfred E. (committee member), Gerken, H. J., Jr. (committee member).
Subjects/Keywords: Simmental cattle; LD5655.V855 1987.M428
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APA (6th Edition):
Meacham, N. S. (1987). Heritability estimates for calving date in Simmental cattle. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/45782
Chicago Manual of Style (16th Edition):
Meacham, Nancy S. “Heritability estimates for calving date in Simmental cattle.” 1987. Masters Thesis, Virginia Tech. Accessed January 22, 2021.
http://hdl.handle.net/10919/45782.
MLA Handbook (7th Edition):
Meacham, Nancy S. “Heritability estimates for calving date in Simmental cattle.” 1987. Web. 22 Jan 2021.
Vancouver:
Meacham NS. Heritability estimates for calving date in Simmental cattle. [Internet] [Masters thesis]. Virginia Tech; 1987. [cited 2021 Jan 22].
Available from: http://hdl.handle.net/10919/45782.
Council of Science Editors:
Meacham NS. Heritability estimates for calving date in Simmental cattle. [Masters Thesis]. Virginia Tech; 1987. Available from: http://hdl.handle.net/10919/45782
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