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Limitations in digestible methionine in the intestine (MetDI) for milk protein secretion in dairy cows fed a ration based on grass silage

Published online by Cambridge University Press:  20 November 2017

Y. Chilliard
Affiliation:
INRA Clermont Theix
J. Rouel
Affiliation:
INRA Clermont Theix
A. Ollier
Affiliation:
INRA Clermont Theix
J. Bony
Affiliation:
INRA Clermont Theix
K. Tanan
Affiliation:
CCPA Osny, Paris
B.K. Sloan
Affiliation:
RPAN Antony, Paris
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Extract

The interest for increasing post-ruminal methionine supplies for dairy cows fed maize silage based rations has been clearly demonstrated (Sloan 1992). Theoretically grass silage based rations are also deficient in methionine in most dietary situations. Expressed as a percentage of PDIE (protein digestible in the small intestine when energy is limiting microbial protein synthesis in the rumen) the metDI value for grass silage approximates 1.95 compared to 1.97 for maize silage.

This trial was conducted, to verify, if in practice, methionine alone could limit milk protein secretion in dairy cows fed grass silage based rations.

Type
Cattle Nutrition & Production
Copyright
Copyright © The British Society of Animal Science 1995

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References

1 Rulquin, H. (1992) INRA - Productions Animates, 5, 29 36 10.20870/productions-animales.1992.5.1.4219CrossRefGoogle Scholar
2 Rulquin, H. and Verite, R. (1993) INRA - In Recent Advances in Animal Nutrition Edited by Garnswortly, P.C. and Cole, D.J.A. Nottingham University Press, 55 77 Google Scholar
3 Sloan, B.K. - Journées AFTAA-CAAA, 26 to 27/02/1992, Tours FranceGoogle Scholar