Breeding soundness examination of North American bison bulls

James Keen, Gary P. Rupp, Paul A. Wittenberg, Ronald E. Walker

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Objective - To evaluate the breeding soundness examination procedure in plains bison bulls. Design - Multiyear (1993 through 1997) cross-sectional clinical procedure evaluation. Animals - Two hundred thirty-four 28-to 30-month-old bison bulls at Custer State Park Procedure - Breeding soundness examinations were performed on all bison bulls using 1992 Society for Theriogenology guidelines for beef cattle semen evaluation and reproductive tract examination. Linear and logistic regression analyses were used to detect correlations and associations among breeding soundness examination variables. Results - Scrotal circumference (SC) was significantly correlated with body weight, percentage of normal spermatozoa, percentage of primary spermatozoal defects, and percentage of motile spermatozoa. Scrotal circumference was positively associated with increased odds of semen collection, satisfactory motility (≥ 30% motility), satisfactory morphology (≥ 70% normal spermatozoa), and simultaneous satisfactory motility and morphology. Receiver-operator characteristic curve analysis selected 29 cm as the optimal SC cutoff most predictive of simultaneous satisfactory spermatozoal motility and morphology. Only 36.2% (83/229) of the bison bulls had a SC of 29 cm or greater and satisfactory spermatozoal motility and morphology. Clinical Implications - SC is a good indicator of adequate spermatozoal motility and structure in bison. We recommend use of 30% spermatozoal motility, 70% normal spermatozoal morphology, and 29-cm SC as minimal satisfactory measurements for breeding soundness examinations of 28-to 30-month-old bison bulls that have been raised on forage-based nutrition. (J Am Vet Med Assoc 1999;214:1212-1217).

Original languageEnglish (US)
Pages (from-to)1212-1217
Number of pages6
JournalJournal of the American Veterinary Medical Association
Volume214
Issue number8
StatePublished - Apr 15 1999

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Bison
breeding soundness
bison
Breeding
bulls
sperm motility
Spermatozoa
spermatozoa
Semen
semen
Ideal Body Weight
operator regions
animal reproduction
beef cattle
Bison bison
Linear Models
Logistic Models
Regression Analysis
forage
Guidelines

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Breeding soundness examination of North American bison bulls. / Keen, James; Rupp, Gary P.; Wittenberg, Paul A.; Walker, Ronald E.

In: Journal of the American Veterinary Medical Association, Vol. 214, No. 8, 15.04.1999, p. 1212-1217.

Research output: Contribution to journalArticle

Keen, J, Rupp, GP, Wittenberg, PA & Walker, RE 1999, 'Breeding soundness examination of North American bison bulls', Journal of the American Veterinary Medical Association, vol. 214, no. 8, pp. 1212-1217.
Keen, James ; Rupp, Gary P. ; Wittenberg, Paul A. ; Walker, Ronald E. / Breeding soundness examination of North American bison bulls. In: Journal of the American Veterinary Medical Association. 1999 ; Vol. 214, No. 8. pp. 1212-1217.
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