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Influences of diet and body condition on the nitrogen utilization in the cow

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 dietary and individual factors influencing the utilization of digestible nitrogen in the dry cow were studied with numerous rations fed to Friesian cows kept in metabolism stalls.

Urinary nitrogen excretion and nitrogen balance were above all influenced by the level of digestible nitrogen intake. They are also correlated to metabolizable energy and digestible potassium intakes.

Endogenous urinary nitrogen, estimated by extrapolation, was 30·6 mg N/kg body weight/d or 0·169 W0·73 g/d with the rations meeting approximately the energy maintenance requirements of the cow.

The changes in diet accounted for 80% of the variability of nitrogen balance.

A method was worked out for calculating the body condition of the cow from the live-weight variations.

The changes in body condition accounted for 11% of the variability of nitrogen balance.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 2 , October 1972 , pp. 323 - 329
Copyright
Copyright © Cambridge University Press 1972

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