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Journal of Dairy Science Vol. 73 No. 9 2516-2524
© 1990 by American Dairy Science Association ®
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Rectovaginal Constriction in Jersey Cattle: Genetics and Breed Dynamics

H. W. Leipold 1, K. Huston 2, E. P. Barton 3, J. R. Holman 4, and D. L. Troyer 5

1 Department of Pathology, Kansas State University, Manhattan 66506
2 Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691
3 American Jersey Cattle Club, 2105 South Hamilton Road, Columbus, OH 43227
4 Department of Statistics, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691
5 Department of Anatomy and Physiology, Kansas State University, Manhattan 66506

Data from farmer-owned herds and from experimental matings supported monofactorial recessive inheritance of rectovaginal constriction in US Jersey cattle. Kempthorne's population genetics model of a recessive trait involving only male selection was extended to include mutation and converted to selection of females only. Computer analyses with that model estimate slow decline in the frequency of the gene for rectovaginal constriction. Practical dynamics of the disorder in a breed registering 50,000 females and 2,000 males annually are given for current conditions and after 500 generations of selection.

Key Words: rectovaginal constriction • Jersey cattle • genetic model

Submitted on October 2, 1989
Accepted on March 14, 1990






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Copyright © 1990 by the American Dairy Science Association ®.