Document Detail

Breeding soundness examination of North American bison bulls.
MedLine Citation:
PMID:  10212686     Owner:  NLM     Status:  MEDLINE    
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 (> or = 30% motility), satisfactory morphology (> or = 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 E Keen; G P Rupp; P A Wittenberg; R E Walker
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American Veterinary Medical Association     Volume:  214     ISSN:  0003-1488     ISO Abbreviation:  J. Am. Vet. Med. Assoc.     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-06-25     Completed Date:  1999-06-25     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7503067     Medline TA:  J Am Vet Med Assoc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1212-7     Citation Subset:  IM    
USDA, Agricultural Research Service, US Meat Animal Research Center, Clay Center, NE, USA.
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MeSH Terms
Bison / anatomy & histology*,  physiology*
Body Weight
Confidence Intervals
Cross-Sectional Studies
Genitalia, Male / anatomy & histology
Linear Models
Logistic Models
Odds Ratio
Physical Examination / veterinary
ROC Curve
Scrotum / anatomy & histology
Semen / cytology,  physiology
Sperm Motility
Spermatozoa / ultrastructure

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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