Milk Urea Nitrogen and Infertility in Florida Holstein Cows
- 1 March 2000
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 83 (3), 459-463
- https://doi.org/10.3168/jds.s0022-0302(00)74903-4
Abstract
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 nonpregnancy 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.Keywords
This publication has 22 references indexed in Scilit:
- Effect of Ruminant Grade Menhaden Fish Meal on Reproductive and Productive Performance of Lactating Dairy CowsJournal of Dairy Science, 1997
- A Statistical Evaluation of Animal and Nutritional Factors Influencing Concentrations of Milk Urea NitrogenJournal of Dairy Science, 1997
- Effects of Dietary Crude Protein, Breed, Parity, and Health Status on the Fertility of Dairy CowsJournal of Dairy Science, 1996
- Plasma and milk urea nitrogen in relation to pregnancy rate in lactating dairy cattle.Journal of Animal Science, 1996
- Reduction of fertility and alteration of uterine pH in heifers fed excess ruminally degradable protein1Journal of Animal Science, 1993
- Alterations of pH in response to increased dietary protein in cattle are unique to the uterus1Journal of Animal Science, 1993
- Nutritional Factors Influencing the Nitrogen Composition of Bovine Milk: A ReviewJournal of Dairy Science, 1992
- Effects of Excess Degradable Protein on Postpartum Reproduction and Energy Balance in Dairy CattleJournal of Dairy Science, 1990
- Impact of Protein Nutrition on Reproduction in Dairy CowsJournal of Dairy Science, 1989
- Influence of Protein Intake and Feeding Strategy on Reproductive Performance of Dairy CowsJournal of Dairy Science, 1988