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Effects of Diaryliodonium Chemicals on Nitrogen Utilization in Growing Steers

University of Pennsylvania, Kennett Square 19348 and and Smith Kline Beckman Corporation, West Chester, PA 19380

Abstract

Diaryliodonium chemicals increased nitrogen (N) absorption, utilization of absorbed N and N retention in growing steers. Fifty parts per million of the chemicals (diphenyliodonium chloride, diphenyliodonium bromide, 4,4'-difluoro-diphenyliodonium chloride or 4,4'-dimethyl-diphenyliodonium chloride) in the diet appeared sufficient to promote significant (P<.05 or .10) improvements in N utilization. Diet digestibility was either not affected or improved slightly. We suggest that diaryliodonium chemicals improve N utilization by adjusting the ruminal degradation of dietary protein to yield more amino-N and less ammonia-N.

¹ Nutr. Sect. Dept. of Clin. Studies, School of Vet. Med., Univ. of Pennsylvania.

² Applebrook Res. Center, Smith Kline Anim. Health Products Div., 1600 Paoli Pike, West Chester, PA.