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Urea and allantoin in the milk of cows during and after feeding protein in excess or protein deficiency 5. the influence of incorrect protein nutrition of lactating cows and its residual effects



Urea and allantoin in the milk of cows during and after feeding protein in excess or protein deficiency 5. the influence of incorrect protein nutrition of lactating cows and its residual effects



Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 54(3): 141-151



The influence of excessive or deficient protein supply and its residual effects on the contents of crude protein, urea and allantoin in the milk of dairy cows was studied. The used isocaloric rations differed only in the contents of crude protein. The content of urea in the milk varied significantly by changing the N supply (8.7, 17.7 and 29.4 mg urea/100 ml milk in average with 11.6, 14.5 and 17.6% crude protein), while allantoin and crude protein were not influenced. There was a linear dependence between ration crude protein and milk urea content, and an additional effect of the amount of milk nitrogen on urea content. This effect of milk yield has to be considered in the so-called milk urea test for what proposals are made. Residual effects on the content and excretion of milk urea were not observed. Of the allantoin produced daily 6-7% was excreted with the milk. Protein depletion seems to reduce the production of microbial protein which is indicated by a decrease of .apprx. 14% in the excretion of allantoin, whereas feeding protein in excess did not influence allantoin excretion. Increased intake of dry matter and increased milk yield caused a linear increase in the amount of milk allantoin. No residual effects on allantion excretoin were noticed.

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