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Factors affecting food efficiency and body composition of growing ruminants offered straw-based diets: supplementation with lipids with and without protein meal

Published online by Cambridge University Press:  02 September 2010

M. F. J. van Houtert ,
H. B. Perdok  and
R. A. Leng
M. F. J. van Houtert
Affiliation:
Department of Biochemistry, Microbiology and Nutrition, University of New England, Armidale, NSW 2351, Australia
H. B. Perdok
Affiliation:
Department of Biochemistry, Microbiology and Nutrition, University of New England, Armidale, NSW 2351, Australia
R. A. Leng
Affiliation:
Department of Biochemistry, Microbiology and Nutrition, University of New England, Armidale, NSW 2351, Australia
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Abstract

Growing heifers (experiment 1) and wether lambs (experiments 2 and 3) were offered ammoniated cereal straw with or without a protein meal. The effects of supplementation with long-chain fatty acids (LCFA; as calcium salts of LCFA (CaLCFA) or fat prills) on nutrient utilization were studied.

Intake of the basal diet (g/kg live weight) was unaffected by the protein meal, but was often reduced by supplementation with LCFA, especially fat prills. Live-weight gain was increased both by supplementation with protein meal and CaLCFA. Fat prills only increased live-weight gain in the presence of protein meal and depressed live-weight gain in the absence of protein meal. There were small differences between the two sources of LCFA in their apparent effects on rumen fermentation.

Supplementation with protein meal increased relative protein content (P < 0·05) and tended to increase water content (P > 0·05) in the wethers in experiment 3 (corrected to equal empty-body weight at slaughter). Of the LCFA, only CaLCFA tended to increase relative body fat content (by proportionately 0·23; (P > 0·05) but decreased relative protein and water content by 0·05 and 0·06 (P < 0·05).

Supplementation of straw-based diets with as little as 20 g CaLCFA per kg food dry matter improved live-weight gain and efficiency of nutrient utilization of ruminants, particularly when offered in combination with a protein meal. There appeared to be marked differences in the effects of CaLCFA and fat prills on food intake, productivity and to some extent body composition.

Keywords

body compositiondietary fatdietary proteinrumen fermentationstraw
Type
Research Article
Information
Animal Production , Volume 51 , Issue 2 , October 1990 , pp. 321 - 331
Copyright
Copyright © British Society of Animal Science 1990

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