Relationships among milk urea-nitrogen, dietary ...

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Title Relationships among milk urea-nitrogen, dietary parameters, and fecal nitrogen in commercial dairy herds
Author(s) Pipat Arunvipas, John A. VanLeeuwen, Ian R. Dohoo, Greg P. Keefe, Shelley A. Burton, Kerry D. Lissemore
Journal Canadian Journal of Veterinary Research
Date 2008
Volume 72
Issue 5
Start page 449
End page 453
Abstract Our study objective was to determine the ability of milk urea-nitrogen concentrations ([MUN]) to predict fecal nitrogen concentrations ([Fecal N]) in commercial dairy herds. A total of 83 dairy herds were each visited 3 times within 48 h after a monthly herd milk test. For each farm visit, forages were sampled for nutrient analyses, which were entered into a computerized ration evaluator, and fecal samples were taken per rectum from each of 6 cows (2 early-, 2 mid-, and 2 late-lactation). Fecal samples were pooled, mixed, and analyzed for nitrogen content. Fecal nitrogen concentrations were compared with the routinely measured nutritional parameters from the ration evaluation, and the herd average [MUN] for the previous milk test date using mixed linear regression analyses. Total protein supplied in the ration was significantly positively associated with [Fecal N], but herd average [MUN] was not associated (P > 0.10) with [Fecal N].

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