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Nitrogen Utilization in Ponies

Cornell University, Ithaca, New York¹ 14850

Abstract

Two balance trials were conducted with mature gelding ponies. In the first trial the addition of isonitrogenous amounts of urea, soybean meal or linseed meal to the basal diet increased nitrogen retention and apparent protein digestibility. The percent retention of the absorbed nitrogen was similar for ponies fed all three supplemented diets. In the second trial, feeding urea or putting urea directly into the cecum resulted in similar increases in nitrogen retention and apparent digestibility of protein. The results were compared to several other recent reports on urea utilization in horses and ponies and it was concluded that equines can utilize urea to increase nitrogen retention when fed low protein diets but that in general the efficiency of the utilization of the absorbed N from urea is less than that of N from performed protein.

¹ Equine Research Program, College of Agriculture and College of Veterinary Medicine.