Nitrogen balance and nitrogen utilization of cows during and after feeding protein in excess 2. the influence of incorrect protein nutrition of lactating cows and its residual effects

Kreuzer, M.; Kirchgessner, M.

Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 53(5): 270-279


Accession: 005985957

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The effects of incorrect protein nutrition on N balance and N utilization were studied in an experiment on metabolism with 18 lactating cows. If N supply was changed, there was a complementary reaction in fecal and urinary excretion. Feeding protein in excess caused a nearly complete removal of the surplus N by the way of the urinary excretion, while protein malnutrition helped to save N. fecal N excretion was nearly constant. No clear consequences of incorrect protein nutrition were recognizable, but a lapse of some days seemed to be necessary for adjustment. Body protein reduction was higher in depleted cows than in controls but feeding an excess cannot raise N storage. This may be explained by the high additional requirements for building reverses, and confirms that N storage does not increase on realimentation after malnutrition. N utilization for retention and milk production is reduced with higher intake of crude protein. This effect gets stronger with increase in excess protein.