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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

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