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The energy value to sheep of saturated and unsaturated fat fed singly or in combination

Published online by Cambridge University Press:  02 September 2010

F. W. Wainman  and
P. J. S. Dewey
F. W. Wainman
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
P. J. S. Dewey
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

Four diets containing either 0 or 50 g fat per kg were prepared from a basal mix of barley, sugar-beet pulp, soya-bean meal and molasses. The fats used were tallow (saturated), soya-acid oil (unsaturated), or a 45:5 mixture of both fats. The diets were given with chopped dried grass to adult wether sheep in the ratio 4:1 of diet to dried grass. Measurements of heat production of the sheep were made in closed-circuit respiration chambers and from the data the efficiencies of utilization of energy for maintenance (km) and production (kf) were calculated for each diet, together with the metabolizable energy (ME) values for the fats.

Values for both km and kf were not significantly different between diets, the means were 0·81 and 0·61 respectively. The ME values (MJ/kg DM) of the fats were for tallow 36·2, for soya-acid oil 36·6 and for the tallow/soya mixture 31·6; these values were not significantly different.

No evidence of any synergistic effect caused by the addition of an unsaturated fat to a saturated fat was seen in this experiment.

Type
Research Article
Information
Animal Production , Volume 44 , Issue 2 , April 1987 , pp. 227 - 232
Copyright
Copyright © British Society of Animal Science 1987

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References

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