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Sulphur as a nutrient for Merino sheep

1. Storage of sulphur in tissues and wool, and its secretion in milk

Published online by Cambridge University Press:  09 March 2007

J. P. Langlands  and
H. A. M. Sutherland
J. P. Langlands
Affiliation:
CSIRO, Division of Animal Physiology, Pastoral Research Laboratory, Armidale, NSW 2350, Australia
H. A. M. Sutherland
Affiliation:
CSIRO, Division of Animal Physiology, Pastoral Research Laboratory, Armidale, NSW 2350, Australia
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Abstract

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1. Faecal and urinary sulphur excretions of Merino sheep given fifty-one forage diets were measured in 205 balance experiments to derive estimates of the dietary requirements of Merino sheep for S.

2. Faecal S excretion varied with the S, organic matter and digestible organic matter intakes. Non-dietary faecal S excretion was estimated by regression analysis and was approximately 0·7 g S/kg organic-matter intake. Apparent S digestibility declined linearly with the reciprocal of dietary S content, and was predicted to be zero when the dietary S content was 0·81 g S/kg organic matter.

3. Both urinary S excretion and S retention varied with the digestible S and digestible organic-matter intakes. Endogenous urinary S excretion was taken to be the urinary S excretion when digestible S intake was zero, and the sheep was at zero energy balance. It was estimated by regression analysis to be 38 mg S/d.

4. The S and digestible S intakes necessary to maintain the fleece-free tissues in S equilibrium can be calculated from the equations derived in this study. An example is presented.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 30 , Issue 3 , November 1973 , pp. 529 - 535
Copyright
Copyright © The Nutrition Society 1973

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