J. Anim Sci.
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J. Anim Sci. 1972. 35:1069-1075.
© 1972 American Society of Animal Science
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Influence of Widely Diverse Finishing Regimens and Breeding on Depot Fat Composition in Beef Cattle1

T. S. Rumsey2, R. R. Oltjen2, K. P. Bovard3 and B. M. Priode4

U. S. Department of Agriculture, Beltsville, Maryland 20705 and Virginia Polytechnic Institute and State University, Blacksburg, Virginia 22630

Abstract

TWO trials were conducted with beef cattle to study differences in depot fat composition associated with the use of widely differing finishing diets. A third trial was conducted to determine the influence of genetic background on fat composition. Alfalfa and timothy all-forage diets were associated with typically saturated depot fat. An all-concentrate diet increased the total unsaturated acids by 20% over the all-forage diets, and most of the increase was in oleic acid. Feeding all-forage the first half and all-concentrate the second half of the finishing period or vice versa produced a fat of similar saturation as when all-concentrate was fed continuously. Selecting cattle for growth irrespective of genetic base did not influence depot fat composition. However, fat composition varied significantly among inbred lines established from different genetic bases. In all trials, an increase in unsaturation was reflected most consistently by an increase in C18:1. These trials indicate that unsaturation of depot fat in cattle is influenced to a limited extent by current diets and that genetic selection for growth is not associated with changes in fat composition in beef cattle.

Footnotes

1 The authors gratefully acknowledge Dr. G. Samuelson in performing surgical biopsies for fat samples and the assistance of Steve Kozak and Larry Colbert in the fat composition analysis.

2 Research Animal Scientist, A.R.S., Nutrition Institute, Ruminant Nutrition Laboratory, Beltsville, Maryland 20705.

3 Associate Professor of Animal Science, VPI and State University, Division of Research, College of Agriculture and Life Sciences, Front Royal, Virginia 22630.

4 Research Animal Scientist, A.R.S., Front Royal Beef Cattle Station, Front Royal, Virginia 22630.






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Copyright © 1972 by the American Society of Animal Science.