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Effect of Animal Tallow and Hydrolyzed Vegetable and Animal Fat on Ration Utilization and Rumen Volatile Fatty Acid Production with Fattening Steers^1,2,3,

University of Arizona, Tucson

Abstract

Addition of 4% tallow or 4% hydrolyzed vegetable and animal fat (characterized by a high unsaturated C₁₈ acid content) to a fattening ration containing 30% alfalfa hay, 57% grain, 7% molasses, 5% cottonseed meal and 1% dicalcium phosphate did not affect the utilization of the ration components. The added fat was well utilized as measured by digestible energy, TDN and determined caloric value of the TDN.

Total rumen volatile fatty acids or ratios of the fatty acids were not altered by the fat addition.

Conversion of ration carotene as measured by liver vitamin A storage was considerably less for the fat treatments than for the controls.

The fat additions had no effect upon the melting point of the perinephric, external or caudal fat.

Fecal soaps were increased significantly by the fat treatments; however, the absolute increase was relatively small suggesting that fecal soaps did not represent a major loss of energy from added fats.

¹ Arizona Agricultural Experiment Station Technical Paper No. 792.

² From a thesis submitted by the senior author in partial fulfillment of the requirements for an M.S. degree.

³ This research was supported in part by funds and materials from The Procter & Gamble Company, Cincinnati, Ohio.

⁴ Present address is Beaver, Utah.