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Comparison and evaluation of protein evaluation systems currently in use in europe

Published online by Cambridge University Press:  24 November 2017

W.M. van Straalen  and
C. Salaün
W.M. van Straalen
Affiliation:
Research Institute for Livestock Feeding and Nutrition, P.O. Box 160, NL-8200 AD, Lelystad Department of Animal Nutrition, Wageningen Agricultural University, Haagsteeg 4, NL-6708 PM, Wageningen
C. Salaün
Affiliation:
Research Institute for Livestock Feeding and Nutrition, P.O. Box 160, NL-8200 AD, Lelystad
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Extract

In modern protein evaluation systems the protein unit (PU) of a feedstuff and the requirement of PU is expressed as true protein assumed to be absorbed from the small intestine. Total PU supply originates from feed protein escaping rumen degradation and from microbial protein synthesised in the rumen. Escape feed PU is calculated from crude protein (CP) multiplied by the escape CP fraction, amino acid content of escape CP and small intestinal digestibility of escape amino acids. Microbial PU is calculated from the energy source for microbial growth multiplied by the efficiency by which this energy is used for microbial CP synthesis, amino acid content of microbial CP and the digestibility in the small intestine of microbial amino acids.

Type
Application of Protein Rationing Systems for Ruminants
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1993: Winter meeting , March 1993 , pp. 6
Copyright
Copyright © The British Society of Animal Production 1993

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