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Journal of Animal Science, Vol 72, Issue 9 2209-2215, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Interaction of forage level and monensin in diets for feedlot cattle on growth performance and digestive function

R. A. Zinn, A. Plascencia and R. Barajas
Department of Animal Science, Imperial Valley Agricultural Center, University of California, El Centro 92243.

A feedlot growth-performance trial and a metabolism trial were conducted to evaluate the interaction of forage level (10 vs 20%) and monensin (0 vs 28 mg/kg, air-dry basis) on utilization of a steam-flaked corn-based finishing diet. There were no treatment interactions (P > .10) on feedlot cattle growth performance or site and extent of digestion of OM, ADF, N, and starch. Monensin supplementation did not influence (P > .10) ADG, DM intake, feed efficiency, estimated NE value of the diet, or ruminal and total tract digestibility of OM, ADF, and starch. Monensin decreased (14.5%, P < .10) passage of microbial N to the small intestine and ruminal digestion of feed N (10.4%, P < .05). Ruminal pH tended to be slightly lower (1.9%, P < .10) with monensin supplementation. Monensin did not affect (P > .10) ruminal molar proportions of acetate and butyrate. There was an interaction between forage level and monensin on ruminal molar proportions of propionate. With the low-forage diet, molar proportions of propionate were 9.4% higher with monensin supplementation. In contrast, with the high-forage diet ruminal molar proportions of propionate were 5.5% lower with supplemental monensin. Monensin did not affect (P > .10) estimates of methane production. Decreasing the forage in the diet from 20 to 10% increased ADG (10.8%, P < .10), feed efficiency (11.6%, P < .01), and diet NEg (11.3%, P < .05). Ruminal digestibility of ADF, OM, and starch were not affected (P > .10) by forage level.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1994 by the American Society of Animal Science.