Influence of the ruminal N-balance on rumen
metabolism

Fistulated dairy cows were used to investigate the influence of the ruminal N-balance (RNB) on protein metabolism in the rumen. Animals were fed a ration of maize silage and concentrates. RNB amounted to -0.6 g/MJ ME in the basis ration. The other 3 rations were adjusted to RNB-values of -0.3, 0 and 0.3 g/MJ ME by urea supplements. The RNB increase resulted in higher NH₃-N concentrations in the rumen fluid and the duodenal digesta and urea concentrations in the milk and blood. The efficiency of microbial protein (MP) synthesis was the same, g MP/MJ ME was significant lower with RNB -0.6 g/MJ ME as compared to RNB 0. The group with the lowest RNB showed the highest level of feed protein degradation and the lowest organic matter fermentation.

CITATIONS (1):

Duodenal availability of conjugated linoleic acids after supplementation to dairy cow diets
Julia Pappritz, Peter Lebzien, Ulrich Meyer, Gerhard Jahreis, Ronny Kramer, Gerhard Flachowsky, Sven Dänicke
European Journal of Lipid Science and Technology

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1230-1388

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