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Endogenous losses of phosphorus by sheep

Published online by Cambridge University Press:  27 March 2009

J. H. Ternouth
J. H. Ternouth
Affiliation:
Department of Agriculture, University of Queensland, St Lucia, Qld 4067, Australia
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Summary

Twelve sheep were fed semisynthetic roughage diets at three rates to study the effects of intake of dry matter, concentration of phosphorus and the physical form of two low-P barley straws upon the faecal losses of P. The sheep were in negative P balance throughout the experiement. The absorption of dietary P increased with P intake and was unaffected by differences in the physical form of the roughage. For each barley straw diet, endogenous faecal P increased with dry matter intake, and was higher when the roughage was ground than chopped. Over the whole experiment, daily endogenous faecal P ranged from 8·5 to 31·5 mg/kg live weight. Endogenous faecal P was related to P intake or to dry matter intake and plasma inorganic P. The concentration of faecal endogenous P was negatively related to the intake of each diet. It is concluded that the concentration of inorganic plasma P and the rate of salivary secretion are responsible for the endogenous faecal excretion of P and the regulation of P balance in sheep fed low-P diets.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 113 , Issue 3 , December 1989 , pp. 291 - 297
Copyright
Copyright © Cambridge University Press 1989

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