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An estimate of the nutrients utilized for live-weight gain by Merino sheep

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. One hundred and seven fine-wool Merino wethers and non-pregnant ewes varying in age from newly born to 110 months and in live weight from 1.7 to 55.1 kg were slaughtered and minced.

2. The nitrogen, fat, ash, calcium, phosphorus, sodium and potassium contents of the mince were determined. Energy content was estimated from the contents of fat and fat-free organic matter.

3. Weighted regression relationships were calculated between the energy, N, Ca, P, Na and K contents of the sheep, and age, live weight and (age x live weight). The relationships were differentiated with respect to age and live weight, and the rates of nutrient deposition at different rates of live-weight gain, and for sheep differing in age and live weight were calculated.

4. The rates of nutrient deposition were compared with those estimated by the Agricultural Research Council (1965) and by Mitchell (1962). and were in general lower in energy content and higher in ash constituents per unit live-weight gain.

Type
Research Article
Information
British Journal of Nutrition , Volume 23 , Issue 3 , August 1969 , pp. 603 - 609
Copyright
Copyright © The Nutrition Society 1969

References

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