Section 7
Chapter 6,700

The influence of plant crude protein in feed on the utilization of urea in dairy cattle 5. nitrogen 15 fractions in the blood of lactating cows given nitrogen 15 labeled urea intraruminally

Motyl, T.; Barej, W.; Kulasek, G.; Bergner, H.; Goersch, R.; Sommer, A.; Vancisin, J.

Archiv für Tierernährung 34(7): 489-495


ISSN/ISBN: 0003-942X
Accession: 006699556

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The incorporation of urea-15N (given as an intraruminal drench or infusion) into plasma urea and protein of dairy cows fed isoenergetic rations with different levels of plant protein (9, 11, 12, 14, 15 and 17% in dry matter) was investigated. A nonlinear and asymptotic dependence between the plasma concentration of urea and protein level in the ration was stated. The availability of dietary urea-15N for plasma urea for 48 h after administration was lowest in cows fed with low protein rations (9 and 11% of plant protein). On the contrary, the highest incorporation of urea-15N into plasma of these animals was observed. The possible explanation of these results is presented.

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