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Effect of Added Fat with Graded Levels of Calcium to Urea-Containing Rations for Beef Cattle^{1, 2,}

Purdue University, Lafayette, Indiana 47907

Abstract

Animal fat is added routinely to cattle feedlot rations under many feeding systems in the western part of the United States. Since the use of urea as a source of nitrogen in finishing rations for beef cattle has become commonplace, a need for studying the inter-relationships of fat and urea upon animal performance is evident.

Although Embry, Turner and Gastler (1957) observed no depressing effects when fat and urea were fed together, other workers (Jones, Bradley and Grainger, 1961; Bradley et al., 1966; Thompson, Bradley and Little, 1967) have reported unfavorable results. The purpose of this study was to observe the performance of steers, under feedlot conditions and in metabolism studies, when fed rations containing both urea and added animal fat. Also, a feedlot trial was conducted to study the interrelationships of calcium and fat on feedlot performance.

The metabolism studies actually consisted of two separate experiments. In experiment 1 a comparison was made between the basal ration and one containing 3% added animal fat, while in experiment 2 the basal was compared to a 6% added fat ration.

¹ Department of Animal Sciences Journal Paper No. 4487, Purdue University Agricultural Experiment Station.

² The research reported in this study was supported in part by a grant-in-aid from the Fats and Proteins Research Foundation, Inc., 2720 Des Plaines Avenue, Des Plaines, Illinois 60018.

³ Present address: Ralston Purina Company, Beef Cattle Research Division, Checkerboard Square, St. Louis, Missouri 63133.

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