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You searched for +publisher:"University of Tennessee – Knoxville" +contributor:("Frank Neal Schrick"). Showing records 1 – 2 of 2 total matches.

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University of Tennessee – Knoxville

1. Bartenslager, Zachariah Johnson. Occurrence of proximal droplets in performance-tested beef bulls.

Degree: MS, Animal Science, 2018, University of Tennessee – Knoxville

To determine the occurrence of proximal droplets in performance-tested bulls, parameters related to breeding soundness examination (BSE) classification were evaluated. Bulls (542 Angus bulls) were classified as satisfactory (BSE guidelines; Society for Theriogenology) or deferred. On-test risk factors were identified, associated with increased probability for bulls to be deferred due to proximal droplets. On-test weight (<i>P</i> = 0.019), on-test scrotal circumference (<i>P</i> = 0.018) and the covariate of age (<i>P</i> = 0.007) were all associated with the probability for a bull to be deferred on test due to proximal droplets. Accounting for the covariate of age and the effect of on-test SC, bulls in weight category 5 (>500 kg on-test weight) had 12.5 times the odds of deferral due to proximal droplets compared to bulls in weight category 2 (350 – 400 kg) (OR: 12.5, 95% adj. CI: 1.47, 111.11; adj. <i>P</i> = 0.017). Accounting for the covariate of age and the effect of on-test weight, bulls that were categorized as SC on-test 1 (< 30 cm) had 7.9 times the odds for deferral due to proximal droplets compared to bulls categorized as SC 3 (33 – 36 cm; OR: 7.9, 95% CI: 1.4, 44.4; <i>P</i> = 0.012). Additionally, bulls that were categorized as SC 2 (30 – 33 cm) had 4.7 times the odds for deferral due to proximal droplets compared to bulls categorized 3 (33 – 36 cm; 95% CI: 1.1, 20.0; <i>P</i> = 0.03). After accounting for age and bull on-test weight, bulls that were categorized as SC growth 3 (> 6.2 cm growth) had 3.7 times the odds for deferral due to proximal droplets compared to bulls categorized 2 (3.4 to 6.2 cm growth; OR: 3.7, 95% CI: 1.69, 8.26; <i>P</i> = 0.001. In summary, bull on-test weight, on-test scrotal circumference, scrotal circumference growth and age are important factors associated with unsatisfactory classification due to proximal droplets. Occurrence of proximal droplets have been previously associated with bull maturity; however the cause of its relationship to on-test weight, on-test scrotal circumference and rapid scrotal circumference growth in performance-tested bulls remains unclear. Advisors/Committee Members: Frank Neal Schrick, J. Lannett Edwards, Ky G. Pohler, Lewrell G. Strickland.

Subjects/Keywords: proximal droplet; bulls; fertility; scrotal circumference; breeding soundness examination

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

APA (6th Edition):

Bartenslager, Z. J. (2018). Occurrence of proximal droplets in performance-tested beef bulls. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/5038

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bartenslager, Zachariah Johnson. “Occurrence of proximal droplets in performance-tested beef bulls.” 2018. Thesis, University of Tennessee – Knoxville. Accessed December 05, 2020. https://trace.tennessee.edu/utk_gradthes/5038.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bartenslager, Zachariah Johnson. “Occurrence of proximal droplets in performance-tested beef bulls.” 2018. Web. 05 Dec 2020.

Vancouver:

Bartenslager ZJ. Occurrence of proximal droplets in performance-tested beef bulls. [Internet] [Thesis]. University of Tennessee – Knoxville; 2018. [cited 2020 Dec 05]. Available from: https://trace.tennessee.edu/utk_gradthes/5038.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bartenslager ZJ. Occurrence of proximal droplets in performance-tested beef bulls. [Thesis]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_gradthes/5038

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Tennessee – Knoxville

2. Bogart, Amber Nicole. Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress.

Degree: MS, Animal Science, 2007, University of Tennessee – Knoxville

Objectives were to 1) examine effects of heat stress on maturing oocytes to alter the ability of resulting embryos to develop after fertilization, 2) evaluate blastocyst development of compact morulae derived from control or heatstressed oocytes after culture at 38.5°C or 41.0°C, and 3) evaluate effects of heat stress on compact morulae to alter sex ratio. Culture of cumulus oocytes at 41.0°C did not alter ability of presumptive zygotes (PZ) to cleave; however, the proportion of embryos that cleaved to the 8- to 16-cell stage was lower (P = 0.01). Also, the proportion of 8- to 16-cell embryos derived from heat-stressed oocytes undergoing compaction was lower (P = 0.01). Effects of heat stress to reduce compaction was without consequence on morphology, as quality scores of embryos derived from heat-stressed oocytes were similar to those derived from nonheat-stressed oocytes. Application of heat stress to compact morulae derived from nonheat-stressed oocytes did not affect blastocyst development. Also, blastocyst development of compact morulae derived from heat-stressed oocytes was similar to those derived from nonheat-stressed controls. However, if compact morulae derived from heat-stressed oocytes were exposed to 41.0°C, blastocyst development was reduced (P = 0.007). This effect was coincident with an increase in the proportion of degenerate embryos (P = 0.02). Temperature at which oocytes were matured did not alter sex ratio of resulting blastocysts. Rather, there was a tendency for embryo temperature to increase the proportion of male embryos that survived (P < 0.06). Results described herein are significant as they not only clarify the extent to which heat stress during maturation reduces embryonic development after fertilization but are also informative of heat-induced perturbations that carry over to increase the susceptibility of resulting embryos to heat stress. With this in mind, results raise possible concerns about current practices of utilizing MOET in heat-stressed cattle with the intent of obtaining “developmentally-competent” embryos. Additionally, since it was also demonstrated that developmental competence of oocytes has an impact on the responsiveness of resulting embryos to heat stress, effort to clarify developmental competence of oocytes before utilizing in vitro derived embryos to improve fertility of heat-stressed dairy cows is needed. Advisors/Committee Members: J. Lannett Edwards, Frank Neal Schrick, Michael O. Smith.

Subjects/Keywords: Animal Sciences

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Bogart, A. N. (2007). Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bogart, Amber Nicole. “Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress.” 2007. Thesis, University of Tennessee – Knoxville. Accessed December 05, 2020. https://trace.tennessee.edu/utk_gradthes/256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bogart, Amber Nicole. “Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress.” 2007. Web. 05 Dec 2020.

Vancouver:

Bogart AN. Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress. [Internet] [Thesis]. University of Tennessee – Knoxville; 2007. [cited 2020 Dec 05]. Available from: https://trace.tennessee.edu/utk_gradthes/256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bogart AN. Heat-Induced Perturbations during Oocyte Maturation Carry Over to Increase Susceptibility of Preattachment Embryos to Heat Stress. [Thesis]. University of Tennessee – Knoxville; 2007. Available from: https://trace.tennessee.edu/utk_gradthes/256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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