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Flow of microbial and non-microbial N fractions entering the omasal canal in dairy cows

Published online by Cambridge University Press:  20 November 2017

S. Ahvenjärvi ,
A. Vanhatalo  and
P. Huhtanen
S. Ahvenjärvi
Affiliation:
Agricultural Research Centre of Finland, FIN-31600 Jokioinen, Finland
A. Vanhatalo
Affiliation:
Agricultural Research Centre of Finland, FIN-31600 Jokioinen, Finland
P. Huhtanen
Affiliation:
Agricultural Research Centre of Finland, FIN-31600 Jokioinen, Finland
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Extract

In order to provide accurate estimates of protein supply for lactating dairy cows, the effect of feed ingredients on ruminal protein degradability as well as microbial protein synthesis must be determined. The omasal sampling technique coupled with a triple marker method allows the determination of N flow from the reticulorumen with relatively small contribution from endogenous sources (Ahvenjärvi et al., 2000). The objective of the current study was to assess the contribution of microbial and non-microbial fractions to the total flow of N leaving the rumen of lactating dairy cows fed typical feed ingredients.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 150
Copyright
Copyright © The British Society of Animal Science 2001

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References

Ahvenjärvi, S., Vanhatalo, A., Huhtanen, P. and Varvikko, T. 2000. Determination of reticulo-rumen and whole-stomach digestion in lactating cows by omasal canal or duodenal sampling. British Journal of Nutrition 83: 67–77.Google Scholar