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Digestion and Utilization of Cecally Infused Protein by the Equine^{1, 2, 3,}

University of Delaware, Newark 19711

Abstract

Apparent digestibility of protein, nitrogen retention, plasma protein concentration, and plasma urea nitrogen concentration have been determined for ponies receiving cecal infusions of protein in addition to an orally administered basal diet. Cecal administration of fishmeal, soybean meal, or linseed meal increased digestibility of total protein and increased nitrogen retention, but dry matter digestion was significantly decreased when linseed meal was infused. Nitrogen retention expressed as percentage of the nitrogen absorbed was decreased when soybean meal or linseed meal was infused. Plasma protein concentration was not changed by cecal infusion of protein, but plasma urea nitrogen was increased significantly. The results obtained indicate that nitrogen from cecally infused protein is absorbed but in a form that is utilized less efficiently than the nitrogen from protein that is given orally.

¹ Published as Miscellaneous Publication No. 648 with the approval of The Director, Agricultural Experimental Station Contribution No. 8 of the Department of Animal Science and Agricultural Biochemistry, University of Delaware, Newark.

² This investigation was supported in part by Agway, Inc., Syracuse, N. Y.

³ The authors are indebted to H. L. Ashmead, E. I. duPont de Nemours & Co. (Inc.), Photo Products Department, Instrument Products Division, Penn Dawson Drive. Newark, Delaware 19711, for permitting use of the Automatic Clinical Analyzer in the determination of plasma urea nitrogen and plasma protein.