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Effect of Methionine and Ammonium Sulfate upon Performance of Ruminants Fed High Corn Rations¹

University of Nebraska, Lincoln 68503

Abstract

Three feedlot trials, involving 84 steers, 45 lambs and 72 heifers were conducted to determine the effects of methionine and ammonium sulfate upon performance of ruminants fed soybean meal or urea supplemented finishing rations. In none of the three trials was animal performance affected by addition of sulfur to the soybean meal supplemented ration. In the steer and lamb trials, animals fed urea plus ammonium sulfate gained slower, consumed less feed and required more feed per unit of gain than animals fed rations supplemented with urea alone. Methionine or ammonium sulfate additions to the urea supplemented ration did not influence feedlot performance in the heifer trial. In all three trials, carcass grade and dressing percent were not significantly different among treatments. These results indicate that the sulfur content of the soybean meal or urea supplemented rations was adequate for optimum animal performance.

¹ Published with the approval of the Director as Paper No. 3480, Journal Series, Nebraska Agricultural Experiment Station. Research reported was conducted under Protect No. 13–14.

² Present address: Animal Science and Industry Department, Kansas State University, Manhattan 66506.

³ Present address: Animal Science Department, Purdue University, Lafayette, Indiana 47907.