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. A. VanLeeuwen, I. R. Dohoo, E. R. Leger, G. P. Keefe, A. S. Burton, K. D. 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
PubMed ID 17574283

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