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Postruminal Supplemental Methionine Infusion to Sheep Fed High Quality Diets

Applebrook Animal Health Research Center, Smith, Kline and French Laboratories, West Chester, Pennsylvania 19380

Abstract

The abomasal infusion of dl-methionine to growing sheep fed a high quality diet containing 11.6% protein resulted in increased nitrogen retention. Studies indicated that the response was due to methionine per se since the response could not be achieved by infusing a combination of sulfate and urea to provide sulfur and nitrogen at levels equivalent to that supplied by methionine, or by infusing monosodium glutamate to provide additional nitrogen in the amino form.

The series of infusions indicated that 2 to 3 g of abomasally infused methionine per sheep per day was adequate for optimal nitrogen retention. The infusion of 4 g appeared to be an excessive but tolerable amount, and 6 g appeared to be detrimental in that nitrogen retention was depressed. The infusion of methionine to sheep fed a high quality diet containing 14.1% protein also resulted in increased nitrogen retention.

¹ Present Address: Department of Animal Sciences, University of Kentucky, Lexington 40506.