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Journal of Dairy Science Vol. 83 No. 3 459-463
© 2000 by American Dairy Science Association ®
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Milk Urea Nitrogen and Infertility in Florida Holstein Cows

P. Melendez 1, A. Donovan 1, and J. Hernandez 1

1 Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Box 100136, Gainesville 32610-0136

The objective of this study was to evaluate the association between milk urea nitrogen (MUN) and risk of nonpregnancy after first breeding in a commercial dairy herd in Florida. A total of 515 and 558 cows were classified as having high (17 to 25 mg/dl) or low MUN (6 to 16 mg/dl) within 30 d before first breeding; a total of 158 (30.6%) and 189 (33.8%) cows were diagnosed as pregnant, respectively. Logistic regression was used to evaluate the association between MUN and risk of non-pregnancy controlling for other variables associated with fertility (parity, calving season, breeding season). An interaction was found showing that cows with high MUN that were bred during the summer were 18 times (OR = 17.9; 95% CI = 10.0 to 31.7) at higher risk of nonpregnancy compared to cows with low MUN that were bred during the winter.

Key Words: milk urea nitrogen • heat stress • dairy cattle • fertility

Submitted on June 30, 1999
Accepted on October 21, 1999




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