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Soaking of complete fattening rations high in poor roughage. 4. The effect on deposition and fatty acid composition of bovine fat†

Published online by Cambridge University Press:  02 September 2010

Z. Holzer ,
H. Tagari ,
D. Levy  and
R. Volcani
Z. Holzer
Affiliation:
Agricultural Research Organization, Nve Ya'ar Regional Experiment Station, Haifa, Israel
H. Tagari
Affiliation:
Agricultural Research Organization, Nve Ya'ar Regional Experiment Station, Haifa, Israel
D. Levy
Affiliation:
Agricultural Research Organization, Nve Ya'ar Regional Experiment Station, Haifa, Israel
R. Volcani
Affiliation:
Agricultural Research Organization, Nve Ya'ar Regional Experiment Station, Haifa, Israel
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Summary

The effects of diets containing variable percentages of roughage and moisture on depot fats were studied. Treatments were 25 and 45% roughage in the complete fattening diet, and 10, 50 and 75% moisture content of the diets. Depot fats collected post-slaughter from kidney, pelvic, ruminal, cod and trim fats in the carcass (mostly subcutaneous and some intermuscular) were weighed and analysed for their fatty acid composition.

Increasing the quantity of roughage in the diet (from 25 to 45%) significantly decreased ruminal fat deposition. Moistening the feed significantly increased the deposition of kidney, pelvic and cod fat, and significantly reduced the deposition of fat trim in the carcass. The content of unsaturated triglyceride fatty acids was significantly greater in calves fed on the 25% roughage diet. Calves fed on the soaked diets had significantly higher contents of unsaturated fatty acids than the controls.

The content of unsaturated acids was greater in cod fat and carcass trim than in kidney, pelvic or ruminal fat.

Hydrogenation in vitro of fatty acids by ruminal micro-organisms decreased with increasing level of moisture in the diet.

It is suggested that the increased unsaturated fatty acid content of the depot fats of animals fed on soaked diets might be due to a reduction in the hydrogenation of dietary lipid by rumen micro-organisms.

Type
Research Article
Information
Animal Production , Volume 23 , Issue 2 , October 1976 , pp. 173 - 180
Copyright
Copyright © British Society of Animal Science 1976

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References

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