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The effects of defaunation of the rumen on the growth of lambs on low-protein-high-energy diets

Published online by Cambridge University Press:  09 March 2007

S. H. Bird ,
M. K. Hill  and
R. A. Leng
S. H. Bird
Affiliation:
Departments Of Biochemistry And Nutrition andUniversity Of New England, Armidale, NSW 2351, Australia
M. K. Hill
Affiliation:
Departments Of Animal Science, University Of New England, Armidale, NSW 2351, Australia
R. A. Leng
Affiliation:
Departments Of Biochemistry And Nutrition andUniversity Of New England, Armidale, NSW 2351, Australia
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Abstract

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1. The effects of defaunation of the rumen of lambs given low-protein-high-energy diets were studied using animals fed ad lib. a basal diet of sugar and oaten chaff which was supplemented with fish meal at various levels. These diets supported relatively large populations of protozoa in the rumen.

2. A nonly phenol ethoxylate (15 g, Teric GN9; ICI Australia Ltd) given intraruminally, was shown to be an effective means of defaunating the rumen and the lambs were maintained protozoa-free by isolation.

3. In lambs given low levels of fish meal in the diet, the absence of rumen protozoa increased growth rate and improved the food conversion efficiency (g dry matter intake/g growth). These effects were not apparent at high levels of protein supplementation.

4. These results suggested that the absence of rumen protozoa resulted in an increased availability of nutrients supplying both energy and amino acids since the efficiency of food utilization and the rate of wool growth (which is sensitive to amino acid supply) were increased in lambs on the low level of protein supplementation without apparently increasing food intake.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 42 , Issue 1 , July 1979 , pp. 81 - 87
Copyright
Copyright © The Nutrition Society 1979

References

Abou Akkada, A. R. & El Shazly, K. (1974). Appl. Microbiol. 12, 384.CrossRefGoogle Scholar
Bergen, W. G. & Yokoyama, M. T. (1977). J. Anim. Sci. 46, 573.CrossRefGoogle Scholar
Bird, S. H., Baigent, D. R., Dixon, R. M. & Leng, R. A. (1978). Proc. Aust. Soc. Anim. Prod. 12, 137.Google Scholar
Bird, S. H. & Leng, R. A. (1978). Br. J. Nutr. 40, 163.CrossRefGoogle Scholar
Christiansen, W. C., Kawashima, R. & Burroughs, W. (1965). J. Anim. Sci. 24, 730.CrossRefGoogle Scholar
Clarke, R. T. J. (1978). In MicrobialEcologyofthe Gut, p. 251 [Clarke, T. R. J. & Bachop, T., editors]. London: Academic Press.Google Scholar
Coleman, G. S. (1975). In Digestion and Metabolism in the Ruminant, p. 149 [McDonald, I. W. & Warner, A. c. I, editors]. Armidale: University of New England Publishing Unit.Google Scholar
Eadie, J. M. (1962). J. gen. Microbiol. 29, 563.CrossRefGoogle Scholar
Eadie, J. M. &Gill, J. C. (1971). Br. J. Nurr. 26, 155.CrossRefGoogle Scholar
Eadie, J. M. & Hobson, P. N. (1962). Nature, Lond. 193, 503.CrossRefGoogle Scholar
Ferguson, K. A., Carter, H. B. & Hardy, M. H. (1949). Aust. J. biol. Sci. 2, 42.CrossRefGoogle Scholar
Klopfenstein, T. J., Purser, D. B. & Tyznik, W. J. (1966). J. Anim. Sci. 25, 765.CrossRefGoogle Scholar
Leng, R. A. (1976). In Reviews in Ruralscience Vol. 2: From Plant to Animal Protein, p. 85 [Sutherland, T. M., William, J. R. Mc., & Leng, R. A., editors]. Armidale: University of New England Publishing Unit.Google Scholar
Lindsay, J. R. & Hogan, J. P. (1972). Aust. J. agric. Rex 23, 321.CrossRefGoogle Scholar
Minor, S., Macleod, N. A., Preston, T. R. & Leng, R. A. (1977). Trop. Anim. Prod. 2, 163.Google Scholar
Rowe, J., Loughnan, M., Nolan, J. V. & Leng, R. A. (1979). Br. J. Nutr. 41, 393.CrossRefGoogle Scholar
Turner, H. H., Riches, J. H., Roberts, N. F. & Wilson, L. T. (1953). Divl. Rep. Div. Anim. Hhh Prod. CSIRO, Aust 4, Ser.S.W.-2.Google Scholar
Weller, R. A. & Pilgrim, A. F. (1974). Br. J. Nutr. 32, 341.CrossRefGoogle Scholar
Wright, D. E. & Curtis, M. W. (1976). N. Z. Jl agric. Res. 19, 23.CrossRefGoogle Scholar