Investigations on the effect of the ruminal N-balance on rumen metabolism, urea content in blood serum and milk as well as some liver parameters of lactating cows

Archives of Animal Nutrition
Peter LebzienG Flachowsky

Abstract

Seven dairy cows fitted with ruminal and duodenal cannulae were used to investigate the influence of the amount of ruminally available N (Ruminal N-Balance, RNB) on the rumen metabolism and to answer the question on the lowest N-amount in the rumen, without negative effects on the fermentation. Animals were fed a ration on the basis of 7.9 kg corn silage and 7.2 kg concentrates related to dry matter, intended to meet the animals mean NEL and protein requirements. 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 in the concentrates. The increase in RNB resulted in higher NH3-N concentrations in the rumen fluid and in the duodenal digesta and higher urea concentrations in the blood and milk. The significantly highest amount of protein at the duodenum was detected when RNB showed an equilibrium (RNB = 0). The efficiency of microbial protein (MP) synthesis (gMP/kg fermented organic matter) was the same, g MP/d and g MP/MJ ME were significantly lower with RNB = -0.6g/MJ ME as compared to RNB = 0. The group with thelowest RNB showed the highest level of feedprotein degradation as well as the lowest organic matter, NDF and ADF fermentatio...Continue Reading

References

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Citations

Jul 23, 2011·Archives of Animal Nutrition·Anusorn CherdthongChalong Wachirapakorn
Jun 29, 2010·Journal of Animal Physiology and Animal Nutrition·K SteinkeF J Schwarz
Dec 17, 2015·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Christine KaufmannChristian Wenker
Mar 28, 2017·Journal of Dairy Science·F Pino, A J Heinrichs

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