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Various Liquid By-Products as a Protein Supplement to Ruminant Diets^1,2,

The Pennsylvania State University, University Park 16802

Abstract

Animal performance of growing-finishing steers and diet nutritive value were evaluated for five diets varying only in liquid by-product. On a dry matter basis, diets consisted of 55% corn silage, 35% cracked shelled corn, and 10% liquid supplement, which was approximately 5% liquid by-product and 5% cane molasses. Four by-products (condensed whey solubles (CWS), condensed cane solubles (CCS), condensed beet solubles (CBS) and cane molasses (CM)) contained urea; while the fifth, ammonium lignin sulfonate (ALS), contained ammonium salts. There were no differences in average daily gain (P>.05). Feed to gain ratio was highest for steers fed ALS (P<.05), and the lowest dry matter consumption resulted from CBS feeding (P<.01). Cattle fed CBS had lowest feed to gain ratios and this observation differed from all but CCS (P<.01). In the sheep metabolism trial, ALS and CBS had lower dry matter, organic matter, and energy digestibilities. Nitrogen balance was greater for lambs fed CBS than those fed CCS (P<.01) and ALS was higher than CCS (P<.05). The results indicate that all by-products were used satisfactorily as carriers of NPN in liquid protein supplements.

¹ Journal Series of the Pennsylvania Agr. Exp. Sta., Paper No. 5618.

² The authors express their appreciation to National Molasses Co., Willow Grove, PA 19090, for their support of this research, and to Dr. H. V. Alvarez for his technical assistance.