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Effects of the ratio of effective rumen degradable protein to fermentable metabolizable energy on voluntary intake and milk yields of dairy cows

Published online by Cambridge University Press:  20 November 2017

A.R.J. Cabrita ,
A.J.M. Fonseca ,
C. Sampaio ,
E. Gomes  and
R.J. Dewhurst
A.R.J. Cabrita
Affiliation:
Faculdade de Ciências, University of Porto, Campus Agrário de Vairão, Rua do Monte, 4485-661 Vairão, Portugal
A.J.M. Fonseca
Affiliation:
ICBAS, University of Porto, Campus Agrário de Vairão, Rua do Monte, 4485-661 Vairão, Portugal
C. Sampaio
Affiliation:
Divisão de Leite e Lacticínios, Estação Experimental, Direcção Regional de Agricultura do Entre-Douro e Minho, Av. dos Templários 421, Ap 156, 4590 Paços de Ferreira, Portugal
E. Gomes
Affiliation:
ICBAS, University of Porto, Campus Agrário de Vairão, Rua do Monte, 4485-661 Vairão, Portugal
R.J. Dewhurst
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB, UK
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Extract

Diets with low ratios of effective rumen degradable protein (ERDP) to fermentable metabolizable energy (FME) are often offered to dairy cows in Portugal, because they are based on maize silage and protein sources are very expensive. It seems likely that this will restrict microbial protein synthesis and voluntary intake and, consequently, lead to reduced milk yields. The objective of this study was to examine the production response of dairy cows offered diets differing in ERDP/FME ratio.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 184
Copyright
Copyright © The British Society of Animal Science 2001

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References

AFRC, 1993. Energy and Protein Requirements of Ruminants. CAB International, Wallingford, Oxon, England.Google Scholar
Bauer, J.D., 1982. Clinical Laboratory Methods. The C.V. Mosby Company, St. Louis, Toronto, Princeton.Google Scholar