Milk urea-nitrogen negatively affected first-service breeding success in commercial dairy cows in Prince Edward Island, Canada

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...

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Bibliographic Details
Published in:Preventive veterinary medicine 2007-11, Vol.82 (1), p.42-50
Main Authors: Arunvipas, P., VanLeeuwen, J.A., Dohoo, I.R., Leger, E.R., Keefe, G.P., Burton, A.S., Lissemore, K.D.
Format: Article
Language:English
Subjects:
animal breeding
Animals
Breeding
Cattle - physiology
commercial farms
conception
dairy cows
Dairying
Days in milk
Female
First service
first-service breeding
Lactation - physiology
milk
Milk - chemistry
milk analysis
milk composition
Milk production
Milk urea-nitrogen
Nitrogen - analysis
Parity
Pregnancy
Pregnancy Rate
Prince Edward Island - epidemiology
reproductive efficiency
Reproductive performance
Urea - analysis
urea nitrogen
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Summary: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).
ISSN:0167-5877
1873-1716
DOI:10.1016/j.prevetmed.2007.05.005