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7.3 Protein Metabolism and Responses to Abomasal Infusion of Casein + Methionine in Growing Lambs Fed Fresh Primary Growth Ryegrass/Clover Pasture Ad Libitum

Published online by Cambridge University Press:  27 February 2018

T. N. Barry ,
T. R. Manley ,
S. R. Davis  and
Carolyn Redekopp
T. N. Barry
Affiliation:
Invermay Research Centre, Mosgiel, New Zealand
T. R. Manley
Affiliation:
Invermay Research Centre, Mosgiel, New Zealand
S. R. Davis
Affiliation:
Ruakura Research Centre, Hamilton, New Zealand
Carolyn Redekopp
Affiliation:
Department of Endocrinology, Princess Margaret Hospital, Christchurch, New Zealand
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Extract

A considerable loss of nitrogen occurred across the rumen when fresh New Zealand herbages were fed to sheep and live-weight gain of grazing sheep was positively correlated with predicted absorption of amino acids from the small intestine (MacRae and Ulyatt, 1974). This suggests that body growth of young sheep fed some fresh herbages ad libitum may be limited by protein absorption being low in relation to metabolizable energy (ME). The present experiment was designed to test this hypothesis, with special reference to body tissue protein deposition and metabolism, using a diet of ryegrass/white clover pasture.

Type
7. Theatre Presentations I
Information
BSAP Occasional Publication , Volume 6: Forage Protein in Ruminant Animal Production , 1982 , pp. 146 - 148
Copyright
Copyright © British Society of Animal Production 1982

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References

Black, J. L. 1974. Manipulation of body composition through nutrition. Proc. Aust. Soc. Anim. Prod. 10:211–218.Google Scholar
MacRae, J. C. and Ulyatt, M. J. 1974. Quantitative digestion of fresh herbage by sheep. 2. The sites of digestion of some nitrogenous constituents. J. agric. Sci., Camb. 82: 309–319.CrossRefGoogle Scholar
Rattray, P. V. and Joyce, J. P. 1976. Utilisation of metabolisable energy for fat and protein deposition in sheep. N.Z. J. agric. Res. 19: 299–305.Google Scholar
Webster, A. J. F. 1976. Efficiencies of energy utilisation during growth. In Meat Animals, Growth and Productivity (ed. Lister, D., Rhodes, D. N., Fowler, V. R. and Fuller, M. F.), p. 89, Plenum Press. London.Google Scholar