Urea in dry-rolled corn diets: finishing steer performance, nutrient digestion, and microbial protein production

Journal of Animal Science
C T MiltonE C Titgemeyer

Abstract

In Exp. 1, 88 yearling steers (332 kg) were fed dry-rolled corn finishing diets to evaluate effects of dietary urea level on performance and carcass characteristics. Diets contained 0, .5, 1.0, or 1.5% urea (DM basis), which supplied all supplemental N, and 10% chopped prairie hay. Gains (P = .10) and gain efficiency (G/F; P < .05) were increased by .5% urea, with little improvement by additional urea. Regression analysis estimated optimal dietary urea at .9% of DM for ADG and G/F. Fat thickness (P < .05) and yield grade (P < .10) increased linearly with dietary urea level. In Exp. 2, four ruminally and duodenally cannulated steers (557 kg) were fed the diets used in Exp. 1 to evaluate effects of dietary urea on site and extent of digestion. True ruminal OM and starch digestion were increased 25 and 37%, respectively, by .5% urea, but higher urea levels did not differ from .5%. Flows of total N and microbial N to the duodenum were not affected by urea level. In Exp. 3, 100 yearling steers (347 kg) were fed dry-rolled corn finishing diets that contained 10% alfalfa hay as the dietary roughage to evaluate effects of dietary urea level on performance and carcass characteristics. Urea levels were 0, .35, .70, 1.05, or 1.40% urea (D...Continue Reading

Citations

Sep 28, 2004·Journal of Animal Science·D J GibbT A McAllister
Sep 26, 2012·Journal of Animal Physiology and Animal Nutrition·M I Recavarren, G D Milano
Jul 6, 2010·Animal Science Journal = Nihon Chikusan Gakkaihō·Kyoung Hoon KimMan-Kang Song
Mar 13, 2014·Journal of Animal Physiology and Animal Nutrition·M I Recavarren, G D Milano
Nov 25, 2020·Tropical Animal Health and Production·Yasmim Rodrigues Vilas Boas E SilvaAdriano Jorge Possamai

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