Published in Scientific Papers. Series D. Animal Science, Vol. LXV, Issue 1
Written by Dănuț Nicolae ENEA, Dorin Dănuț COLCERI, Gheorghe Emil Mărginean, Livia VIDU
The present research proposed to present the dynamics of urea in Holstein cows milk (as ml/dl), in order to evidence and optimize the main factors affecting this parameter. Large amount of data, including Holstein farms along the whole country was included in the study. Statistical results proved that the feeding level of protein is a main factor influencing milk urea content. Protein intake is highly related to milk market price, therefore large differences in milk urea were revealed between hot and cold season (from 40 mg/dl in the hot season to 18 mg/dl in the cold season). Relation between milk urea level, reproduction indices and the productive life was also studied. The most affected indicator by urea excess was the calving – interval (39 mg/dl – CI of 435 days). As a result, we recommend an interval between 22 – 32 mg/dl, in order to optimize milk yield and quality, as well as the reproductive parameters and longevity.
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