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Effect of Diet on the Concentration of Free Amino Acids, Ammonia and Urea in the Rumen Liquor and Blood Plasma of the Sheep^1,2,

University of Sydney, Camden, N.S.W., Australia³

Abstract

Adult, crossbred wethers were fed diets containing 7 to 29 gm. of nitrogen, once daily. There was a significant increase in the concentration of free a amino nitrogen and ammonia in the rumen liquor 1 hr. after feeding and a positive correlation between their concentrations in the rumen and the dietary protein intake. The proportions of the individual free amino acids in the rumen were relatively constant, but there was a significant correlation between dietary glycine intake and its concentration in the rumen.

There was a significant overall increase in the concentration of free a amino nitrogen in the blood plasma due to feeding but no correlation between dietary amino acid intakes and plasma amino acids.

The maximum free amino nitrogen concentration in the rumen liquor was reached 60 min. after feeding and that of ammonia 90 to 130 min. after feeding, and the increased concentrations were maintained for 2 and 6 hr., respectively.

¹ The author wishes to acknowledge the technical assistance of Miss C. Dawson.

² The work was supported in part by grants from the Australian Meat Research Committee.

³ M. C. Franklin Laboratory, Department of Animal Husbandry.