Predicted Transmitting Ability (PTA) for survival was obtained for 90 descendants of Carlin-M Ivanhoe Bell, a tested carrier of lethal conditions of Bovine Leukocyte Adhesion Deficiency and Complex Vertebral Malformation. Forty-nine descendants tested free of both defects, 39 tested positive for one, and 2 tested positive for both. Daughter inbreeding was the best predictive value of survival. As daughter inbreeding increased 1%, survival decreased by 0.83%0.18% for bulls with no defects and decreased by 0.31%0.19% for bulls with one or more defects. As bull inbreeding increased 1%, survival increased 0.19%0.08% for bulls with no defects. Inbreeding of a bull was not detrimental to survival when choosing among active AI bulls. To improve survival, selecting AI bulls with no genetic defects was more beneficial than selection to minimize inbreeding of the bull.

H. A Adams, R. D Shanks

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.45, 2006
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