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Abomasal Levels of Lysine and Methionine in Wethers Fed Polymerized L-Lysine-HCl and Polymerized L-Methionine

Field Crops Utilization and Marketing Research Laboratory, USDA-ARS^,2, Athens, GA 30604

Abstract

Three experiments were conducted with rumen- and abomasum-cannulated wethers to determine the effects of feeding a lysine-urea-formaldehyde polymer (lysine polymer), a methionine-urea-formaldehyde polymer (methionine polymer) or a lysine-methionine-urea-formaldehyde polymer (lysine-methionine polymer) on the daily quantities of crude protein, lysine and methionine reaching the abomasum. In Experiments 1 and 2, the wethers were fed a basal diet plus either L-lysine from L-lysine-HCl or the lysine polymer. Crude protein (CP) in the liquid and total abomasal digesta was not affected by the lysine polymer; however, CP in the solid digesta was increased (P<.10) by the polymer (Experiment 1). Similar overall results were obtained in total CP reaching the abomasum in Experiment 2; but CP was increased in the liquid digesta (P<.10) while CP in the solid digesta was unaffected by treatment. Feeding the lysine polymer in Experiments 1 and 2 significantly increased total daily abomasal lysine but feeding free L-lysine-HCl did not. In Experiment 3, total lysine reaching the abomasum was increased (P<.05) in wethers fed the lysine polymer or the lysine-methionine polymer. There was a trend for increased abomasal methionine in wethers fed the methionine polymer and lysine-methionine polymer, but due to high animal variation within treatment the increases were not significant. Essential amino acids in the plasma were not affected in wethers fed the lysine polymer, even though there appeared to be more lysine available for absorption.

¹ Research Animal Physiologist and Research Chemist, Richard B. Russell Agricultural Research Center, Athens, GA.

² Mention of a commercial product does not imply endorsement by the U.S. Department of Agriculture to the exclusion of others which may be equally suitable.