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Urea in Growing Rations for Beef Steer Calves¹

Cornell University, Ithaca, New York 14850²

Abstract

THE increasing demand and higher cost of high-protein feeds for cattle has led to the common use of urea as a supplemental source of nitrogen. This series of experiments was undertaken to evaluate various levels of urea nitrogen as a substitute for soybean meal nitrogen in low concentrate rations for beef steer calves.

Experimental Procedure

Experiment 1. Forty Hereford steer calves with an average initial weight of 212 kg and a feeder grade of Low Choice were allocated according to weight and grade into four treatment groups. Each of the four lots of steers was full-fed corn silage (25.8% dry matter, 2.2% crude protein) and 0.91 kg of good quality mixed hay ( 17.2 % crude protein) per steer daffy during a feeding period of I54 days. In addition, each group received the protein equivalent of 0.45 kg of soybean meal (50% crude protein) per animal each day from isonitrogenous supplements (table 1).

¹ Data from thesis submitted by J. B. Robertson in partial fulfillment of requirements for the degree of Doctor of Philosophy.

² Department of Animal Science.