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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 November 28, 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. 28 Nov 2020.

Vancouver:

Bartenslager ZJ. Occurrence of proximal droplets in performance-tested beef bulls. [Internet] [Thesis]. University of Tennessee – Knoxville; 2018. [cited 2020 Nov 28]. 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

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