Milk urea-nitrogen negatively affected first-service ...
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| Title | Milk urea-nitrogen negatively affected first-service breeding success in commercial dairy cows in Prince Edward Island, Canada |
| Author(s) | P. Arunvipas, J. VanLeeuwen, I. Dohoo, E. Leger, G. Keefe, A. Burton, K. Lissemore |
| Journal | Preventive Veterinary Medicine |
| Date | 2007 |
| Volume | 82 |
| Issue | 1-2 |
| Start page | 42 |
| End page | 50 |
| Abstract | Our objective of this study was to investigate the relationship between milk urea-nitrogen concentrations ([MUN]) and first-service breeding success (FSBS) in a large number of commercial dairy herds, using various timings on [MUN]. All commercial dairy herds in Prince Edward Island on monthly milk testing (n = 198) formed the sampling frame. Milk components, [MUN], 24-h milk production, and breeding data for all cows from these farms were gathered electronically from a central database. A first service between 1 June 1999 and 31 May 2000 was classified successful (FSBS = 1) if it was the cow's last service and she calved 270-290 d later. Mixed logistic-regression modeling was used to determine the association between FSBS (the outcome variable) and the [MUN] closest to first service, controlling for other possible confounders and clustering effects of cows within the study herds. The final dataset included 2787 successful and 3015 unsuccessful first services. A change in [MUN] on the test closest to first service from 10 to 20 mg/dL was associated with a 13.9% reduction in the odds of FSBS (controlled for parity, milk production and days in milk). (C) 2007 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.prevetmed.2007.05.005 ER |
Using APA 6th Edition citation style.
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