Abomasal Lysine Infusion in Steers Fed a Urea Supplemented Diet

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Abstract
Eight Angus steer calves were fed a urea supplemented diet in a twice replicated 4 × 4 latin square design experiment to determine the influence of abomasal infusion of lysine on nitrogen retention, plasma free amino acids and plasma urea nitrogen. Lysine·HCl equivalent to 0, 12, 24 and 36 g/day of lysine was continuously infused into the abomasum. Abomasal infusion of lysine to growing steers fed the urea supplemented diet resulted in increased nitrogen retention. Maximum nitrogen retention was observed with the infusion of 24 g lysine per day. This response was apparently due to lysine per se, since infusion of this level resulted in retention of 165% of the infused nitrogen. Infusion of 12 g appeared to be inadequate for maximum response, and 36 g resulted in a small decrease in nitrogen retention when expressed as a percentage of nitrogen intake retained. Copyright © 1976. American Society of Animal Science . Copyright 1976 by American Society of Animal Science.

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