Article
Analysis of milk urea nitrogen and lactose and their effect on longevity in Canadian dairy cattle.
Journal of dairy science - 1 Dec 2006
Miglior F, Sewalem A, Jamrozik J, Lefebvre D M, Moore R K
Abstract excerpt
The aim of this study was to assess the phenotypic level of lactose and milk urea nitrogen concentration (MUN) and the association of these traits with functional survival of Canadian dairy cattle using a Weibull proportional hazards model. A total of 1,568,952 test-day records from 283,958 multiparous Holstein cows from 4,758 herds, and 79,036 test-day records from 26,784 multiparous Ayrshire cows from 384...
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