Relationships among milk urea-nitrogen, dietary ...
|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|
|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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