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Statistical research on the digestibility in the cow. I. Dry matter and energy

Published online by Cambridge University Press:  27 March 2009

R. Paquay ,
R. De Baere  and
A. Lousse
R. Paquay
Affiliation:
Department of Animal Physiology, Faculty of Veterinary Medicine, Cureghem, 1070 Brussels, Belgium
R. De Baere
Affiliation:
Department of Animal Physiology, Faculty of Veterinary Medicine, Cureghem, 1070 Brussels, Belgium
A. Lousse
Affiliation:
Department of Animal Physiology, Faculty of Veterinary Medicine, Cureghem, 1070 Brussels, Belgium
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Summary

The results obtained for dry matter and energy digestibility with 116 different rations fed to 242 non-pregnant dry cows and 96 laotating cows were studied.

With winter rations, dry-matter digestibility (Y) is linearly related to dry-matter intake (X1) and to the crude fibre content of the dry matter (X2):

Y = 89·58–0·557X1–0·863X2.

A similar equation was obtained for energy digestibility (Y):

Y = 90·68–0·195X1–0·892X2,

where X1 represents the energy intake (in 1000 kcal) and X2 the crude-fibre content.

Digestible dry matter or energy can be estimated very accurately from dry matter or energy intake and from crude-fibre content.

There is a highly significant linear relation between dry matter or energy digestibility and nitrogen concentration of the faeces, especially with grass.

Dry-matter digestibility is also influenced by the physical form of the feeds and by individual factors.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 78 , Issue 1 , February 1972 , pp. 135 - 139
Copyright
Copyright © Cambridge University Press 1972

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