Effect of Rate of Release of Urea on its Utilization by Sheep

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Abstract
A method of preparing a slow-release urea material by means of physical entrapment and in vitro and in vivo evaluations of it are described. A slow-release urea preparation was selected for animal evaluation based on studies of rates-of-release in artificial saliva and rumen fluid. Experiments were conducted to determine the effects of a reduced release rate of urea in the rumen of sheep on blood urea concentration and nitrogen excretion and the comparative value of urea, slow-release urea and cottonseed meal as supplements to low protein, medium fiber lamb rations. Collectively, the results indicate that reducing the rate of release of urea in the rumen increases its value as a supplemental nitrogen source when included in a medium fiber diet fed to sheep. Results are discussed in relation to acute and sub-acute ammonia toxicity, intraruminal nitrogen utilization and maximum capacity for ruminal protein synthesis. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.

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