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1 Center for Animal Health and Productivity, University of Pennsylvania, School of Veterinary Medicine, New Bolton Center, Kennett Square 19348
Total of 627 AI in 332 Holstein cows in nine herds were used to examine the relationship between serum urea N and conception rate. Cows were assigned randomly to one of three isocaloric diets varying in protein degradability and content. The AI occmed from 50 to 150 DIM. Mean serum urea N for each cow from 50 to 150 DIM was used to examine conception rate and serum urea N. The clinical interpretation of serum urea N on conception rate is evaluated using Bayes theorem from two approaches (dichotomization vs. continuous). Test information resulting from dichotomization of serum urea N into high and low categories (maximizing the average of test sensitivity and specificity) is compared with likelihood ratio approaches allowing a continuous measure. Likelihood ratio test indicates that conception rate decreases with serum urea N of >14.9 mg/dl, but dichotomized test suggests that the decrease does not occur until serum urea N is >20 mg/dl.
Key Words: serum urea nitrogen • conception rate
Submitted on February 4, 1993
Accepted on June 23, 1993
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