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Effect of Dietary Fat Source and Buffer Level on Composition of Depot Fats, Gains and Liver Manganese of Sheep¹

University of Georgia, Athens

Abstract

Forty-four feeder lambs were employed in a 2x2 factorial design experiment to determine the effect of fat source and buffer level in all-concentrate diets on the composition of depot fat and on gains and liver manganese levels.

Significant differences in the weight percents of each fatty acid studied occurred between at least two of three depot sites studied (brisket, backfat and kidney). Sheep fed corn oil deposited significantly more linoleic and oleic acids than tallow-fed animals. Tallow-fed animals deposited significantly more palmitoleic and linoleic acids. Depot stearic acid content also was significantly higher in lambs receiving the higher buffer level and a significant buffer level x site interaction occurred.

Gains were not affected by fat source but were significantly higher in lambs receiving the higher buffer level. Liver manganese levels were significantly higher in corn oil-fed than they were in tallow-fed lambs.

¹ Journal Series Paper No. 179, University of Georgia College of Agriculture Experiment Stations, College Station, Athens.

² Department of Animal Science.

³ The author is grateful to the Monsanto Chemical Company. St. Louis, Mo., Nopco Chemical Company. Harrison, X. J. and Chas Pfizer and Company, Inc., New York, for supplying some of the ingredients. Acknowledgment is also due J. V. Mason for the analyses, E. P. Warren for statistical assistance and F. M. Williams for assistance with the lambs.