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.
| Original language | English |
|---|---|
| Pages (from-to) | 459-463 |
| Journal | Journal of Dairy Science |
| Volume | 83 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2000 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Funding
This study was supported by North Florida Holstein dairy (Bell, FL) and the University of Florida (Gainesville, FL). The research was conducted using the resources of the College of Veterinary Medicine.
Research Keywords
- Dairy cattle
- Fertility
- Heat stress
- Milk urea nitrogen
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