Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(delayed insemination). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Colorado State University

1. Markwood, Matthew. Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows.

Degree: MS(M.S.), Animal Sciences, 2015, Colorado State University

Four studies were conducted to evaluate the efficacy of a delayed timed AI (TAI) protocol. The objective was to evaluate the use of Estrotect patch status to determine optimum TAI implementation. Experiment 1 was conducted with, 997 cows across 6 locations were administered a 7-d CO-Synch + controlled internal drug release (CIDR) estrous synchronization protocol. The experimental design was a 2 x 2 factorial; factors were patch status at 58 h post PGF2α injection (activated or inactivated) and time interval from PGF2α to TAI (58 or 76 h). Patch status was characterized at 58 h post PGF2α into 4 scores: 1 = 0% activated, 2 = 50% activated, 3 = 100% activated, and 4 = missing. Females with a patch status of 3 were considered to be activated and females with patch status of a 1 or 2 were considered to be not activated. Females with missing patches were removed. There was no treatment x location interaction for pregnancy rate (P = 0.96), so data were pooled across locations. There was a tendency (P = 0.07) for an interaction between the main effects for pregnancy rate. Pregnancy rate was greater (P < 0.01) in cows with activated patches at 58 h post PGF2α (67.0%) compared to those with inactivated patches (51.1%). There was no difference (P = 0.99) for pregnancy rate when comparing the 58 (59.9%) vs. 76 h PGF2α to TAI interval (58.7%). Pregnancy rates for cows with a patch status of 3 at 58 h post PGF2α were greater (P < 0.05) than cows with a patch status of 1 or 4 and tended (P = 0.09) to be greater than cows with a patch status of 2. Cows with a patch status of 1 tended (P = 0.06) to have increased pregnancy rates by delaying TAI to 76 h post PGF2α. Although, it was not different (P = 0.13), there was a 7.4 percentage point increase in pregnancy rates for cows with inactivated patches that received TAI at 76 vs. 58 h. Experiment 2 was conducted to evaluate delayed TAI on 1,682 heifers across 3 locations. The objective was to evaluate the use of Estrotect patch status at various recommended and delayed insemination times for a TAI protocol. Experiment 2a was implemented with 1,159 Bos taurus heifers synchronized using a 14 d melengestrol acetate (MGA) – PGF2α protocol. Estrotect patches were applied at the time of PGF2α injection and evaluated at the time of insemination. Heifers were subsequently assigned to 5 treatments: 1) recommended 72 h post PGF2α TAI with activated patches, 2) recommended 72 h post PGF2α TAI with inactivated patches, 3) 12 h delayed TAI with inactivated patches, 4)18 h delayed TAI with inactivated patches, and 5) heifers with missing patches. Experiment 2b was conducted with 449 Bos taurus heifers synchronized using a 14 d MGA – PGF2α protocol. Heifers were divided into 3 treatments: 1) recommended 72 h post PGF2α TAI with activated patches, 2) recommended 72 h post PGF2α TAI with inactivated patches, and 3) an 8 h delayed TAI with inactivated patches. Experiment 2c utilized 74 heifers synchronized with a 7-d CO-Synch plus CIDR protocol. All heifers had Estrotect patches… Advisors/Committee Members: Peel, Kraig (advisor), Ahola, Jason (advisor), Whittier, Jack (committee member), Hadrich, Joleen (committee member).

Subjects/Keywords: delayed insemination; timed artificial insemination; estrus detection aid; beef cattle

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Markwood, M. (2015). Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/167051

Chicago Manual of Style (16th Edition):

Markwood, Matthew. “Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows.” 2015. Masters Thesis, Colorado State University. Accessed April 14, 2021. http://hdl.handle.net/10217/167051.

MLA Handbook (7th Edition):

Markwood, Matthew. “Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows.” 2015. Web. 14 Apr 2021.

Vancouver:

Markwood M. Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows. [Internet] [Masters thesis]. Colorado State University; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10217/167051.

Council of Science Editors:

Markwood M. Effect of delaying time of AI based on Estrotect patch status on pregnancy rates of beef heifers and nursing beef cows. [Masters Thesis]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/167051


Louisiana State University

2. Ferrer, Marí­a Soledad. Post-breeding endometritis after low dose insemination in the mare.

Degree: MS, Veterinary Medicine, 2004, Louisiana State University

Hysteroscopic insemination in mares with delayed uterine clearance (DUC mares) is controversial. While some authors proposed that insemination with a reduced volume and number of spermatozoa may reduce post-mating endometritis, others proposed that the hysteroscopic procedure is inflammatory and should not be used in DUC mares. The overall objectives of this study were to evaluate the incidence and severity of post-mating endometritis in reproductively normal and DUC mares after hysteroscopic insemination at the uterotubal junction, and to determine if hysteroscopic insemination could be used in DUC mares to reduce post-mating endometritis. The mares were classified as normal or DUC based on the presence of intrauterine fluid 24 or 48 hours after a semen challenge. In Experiment 1, the acute endometritis was evaluated 24 hours after insemination. Each mare (n=5 normal, n=5 DUC) received three treatments in three consecutive estrous cycles: UB: uterine body insemination (one billion spermatozoa, 20 mL), HYST: hysteroscopic insemination (five million spermatozoa, 0.5 mL) and SHAM: sham hysteroscopic insemination (semen extender, 0.5 mL). Intrauterine fluid accumulation and uterine leukocyte numbers were not influenced by treatment. In the second experiment, residual endometritis was assessed 48 hours after insemination, and the effect of insemination method on fertility was evaluated. Each mare (n=4 normal, n=5 DUC) received four treatments in four consecutive estrous cycles: UB: uterine body insemination (one billion spermatozoa, 20 mL), HYST: hysteroscopic insemination (five million spermatozoa, 0.5 mL), SHAM: sham hysteroscopic insemination (semen extender, 0.5 mL) and SP: hysteroscopic infusion of seminal plasma (0.5 mL). There was no difference in intrauterine fluid accumulation between treatments in normal mares. HYST and SHAM treatments resulted in more fluid accumulation 24 hours after the procedures in DUC mares than UB and SP. However, leukocyte numbers were not different. It was concluded that the hysteroscopic procedure itself is inflammatory, so it should not be used with the intention of reducing post-mating endometritis. However, the inflammation was not greater than that induced by routine uterine body insemination and fertility was not affected. Therefore, there is no contraindication to its use in mares with delayed uterine clearance.

Subjects/Keywords: endometritis; mare; hysteroscopic insemination; low-dose insemination; delayed uterine clearance

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ferrer, M. S. (2004). Post-breeding endometritis after low dose insemination in the mare. (Masters Thesis). Louisiana State University. Retrieved from etd-01082005-103926 ; https://digitalcommons.lsu.edu/gradschool_theses/1022

Chicago Manual of Style (16th Edition):

Ferrer, Marí­a Soledad. “Post-breeding endometritis after low dose insemination in the mare.” 2004. Masters Thesis, Louisiana State University. Accessed April 14, 2021. etd-01082005-103926 ; https://digitalcommons.lsu.edu/gradschool_theses/1022.

MLA Handbook (7th Edition):

Ferrer, Marí­a Soledad. “Post-breeding endometritis after low dose insemination in the mare.” 2004. Web. 14 Apr 2021.

Vancouver:

Ferrer MS. Post-breeding endometritis after low dose insemination in the mare. [Internet] [Masters thesis]. Louisiana State University; 2004. [cited 2021 Apr 14]. Available from: etd-01082005-103926 ; https://digitalcommons.lsu.edu/gradschool_theses/1022.

Council of Science Editors:

Ferrer MS. Post-breeding endometritis after low dose insemination in the mare. [Masters Thesis]. Louisiana State University; 2004. Available from: etd-01082005-103926 ; https://digitalcommons.lsu.edu/gradschool_theses/1022

.