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Experiments on the nutrition of the dairy heifer

X. Effect on nitrogen utilization for growth of chemical and physical treatment of the principal source of protein in the diet

Published online by Cambridge University Press:  27 March 2009

W. H. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, England
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, England
Valerie J. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, England
J. W. Siviter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, England

Summary

Eight experiments, comprising four randomized-block feeding trials each with 20–45 animals and four changeover-design nitrogen (N) balance trials each with 6–10 animals, were used to study the effect of the addition of formaldehyde to fishmeal and to casein, of severe heating of fishmeal, and of tannin treatment of a mixture of vegetable protein-rich foods on the utilization of N for growth. Added in moderate amounts to rations demonstrated within the experiments to be deficient in N, quantities, but not the preparations, of N in the diet were critical to growth save at very low N intakes when the untreated foodstuffs were used more efficiently. Additional energy given in isonitrogenous rations increased growth, reducing N losses in the urine.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1978

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