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The effects of postruminal supplements of casein and of soya-protein isolate with or without additional amino acids on silage intake and milk production in dairy cows

Published online by Cambridge University Press:  24 November 2017

Jai-Jun Choung  and
David G. Chamberlain
Jai-Jun Choung
Affiliation:
Hannah Research Institute, Ayr KA6 5HL
David G. Chamberlain
Affiliation:
Hannah Research Institute, Ayr KA6 5HL
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Extract

When the proteins are given direct into the abomasum of dairy cows receiving diets based on grass silage, casein produces much greater responses of milk production than do equivalent amounts of soya-protein (Choung and Chamberlain 1991a, b). However, the cause of these differences of response is not known. In feeding trials, supplementation of silage diets containing soya bean meal with rumen-protected forms of the amino acids thought to be most limiting, methionine and lysine, has been without effect (Girdler et al 1988).

Type
Rumen Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 202
Copyright
Copyright © The British Society of Animal Production 1992

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References

Beynen, A.C, West, C.E., Spaaij, C.J.K., Huisman, J., Leeuwen, P. van, Schutte, J.B. and Hackeng, W.H.L. (1990) J. Nutr. 120, 422–430.Google Scholar
Choung, J.-J. and Chamberlain, D.G. (1991a) Br. J. Nutr. (in press).Google Scholar
Choung, J.-J. and Chamberlain, D.G. (1991b) J. Sci. Fd Aqric. (in press).Google Scholar
Girdler, C.P., Thomas, P.C. and Chamberlain, D.G (1988) Proc. Nutr. Soc. 47, 50A.Google Scholar