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Abomasal Lysine Infusion in Steers Fed a Urea Supplemented Diet¹

University of Kentucky^,4, Lexington 40506

Abstract

Eight Angus steer calves were fed a urea supplemented diet in a twice replicated 4 x 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.

¹ This paper (No. 75-5-20) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

² Present address: South Mississippi Branch Experiment Station, Poplarville, Mississippi 39470.

³ Present address: University of Wisconsin, Madison, Wisconsin.

⁴ Department of Animal Science.