HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hays, V. W. Articles by Catron, D. V. Search for Related Content PubMed Articles by Hays, V. W. Articles by Catron, D. V.

Studies on the Utilization of Urea by Growing Swine¹

Iowa Agricultural Experiment Station²

Abstract

The results of three experiments indicate that urea has no place in practical swine rations. Low levels of urea of 0.16 and 0.31% of the ration exerted no harmful effect on gains; slightly improved gains were obtained at these levels, however, feed required per lb. of gain increased linearly as urea increased from 0.0 to 1.25% of the diet. Also percent nitrogen retained decreased as the level of urea in the diet was increased.

The addition of 0.65% urea or, 0.04% methionine and 0.26% lysine or a combination of the urea and amino acids failed to significantly improve an 8% protein corn-soybean oil meal type ration in respect to rate of gain or feed conversion.

The replacement of 10 or 20% of the protein with equivalent amounts of urea nitrogen, in diets containing 8 or 10% total protein from a mixture of whole dried egg and dried skimmilk, significantly decreased the rate of gain and increased the feed required per pound of gain. The decreased performance was more severe on the lower level of protein

¹ Journal Paper No. J-3026 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project no. 930.

² Department of Animal Husbandry. Grateful acknowledgement is made to L. D. Jones and W. S. Monlux, Veterinary Medical Diagnostic Laboratory for examining various organs; to E. A. Kline and his staff for their help and for the use of the facilities in the Meat Laboratory in slaughtering the pigs; and to Don Quinn, Swine Nutrition Research Farm Superintendent, and his associates for their assistance.