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The rate of response of wool growth to abomasal supplements of casein

Published online by Cambridge University Press:  27 March 2009

P. J. Reis  and
A. M. Downes
P. J. Reis
Affiliation:
C.S.I.B.O., Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia
A. M. Downes
Affiliation:
C.S.I.B.O., Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, N.S.W., Australia
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Summary

Casein in amounts ranging from 10 to 124 g/day was administered as an abomasal infusion to seven Merino wethers whose daily ration comprised 600–700 g of either chopped wheaten hay alone or a mixture of chopped wheaten and lucerne hays. Increases in both the length growth rate and diameter of the wool occurred at all levels of supplementation tested. When casein was infused at the rate of 100 g/day for a 20-day period the biggest increases in wool growth occurred during the first 4 days and there was little further change after the first 8 days.

There were marked wool growth responses to the infusion of up to 80 g casein per day. The results suggest that little further increase could be expected with the infusion of more than 120 g/day.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 1 , February 1971 , pp. 173 - 176
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Downes, A. M., Clarke, W. H. & Dagg, T. C. (1967). Use of radioisotopes in the measurement of wool growth. Atom. Energy Sydney 10 (2), 2.Google Scholar
Downes, A. M. & Lyne, A. G. (1961). Studies on the rate of wool growth using [35S]cystine. Aust. J. biol. Sci. 14, 120.CrossRefGoogle Scholar
Downes, A. M., Reis, P. J., Sharry, L. F. & Tunks, D. A. (1970). Metabolic fate of parenterally administered sulphur-containing amino acids in sheep and effects on growth and composition of wool. Aust. J. biol. Sci. (in the Press).Google Scholar
Ferguson, K. A., Hemsley, J. A. & Reis, P. J. (1967). Nutrition and wool growth. The effect of protecting dietary protein from microbial degradation in the rumen. Aust. J. Sci. 30, 215.Google Scholar
Hogan, J. P., Weston, R. H. & Lindsay, J. R. (1968). Influence of protein digestion on plasma amino acid levels in sheep. Aust. J. biol. Sci. 21, 1263.CrossRefGoogle ScholarPubMed
Reis, P. J. (1969). The growth and composition of wool. V. Stimulation of wool growth by the abomasal administration of varying amounts of casein. Aust. J. biol. Sci. 22, 745.Google Scholar
Reis, P. J. & Schinckel, P. G. (1964). The growth and composition of wool. II. The effect of casein, gelatin, and sulphur-containing amino acids given per abomasum. Aust. J. biol. Sci. 17, 532.CrossRefGoogle Scholar