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Levels of Monensin with and without Tylosin for Growing-Finishing Steers

University of Kentucky, Lexington 40506^1,2,

Abstract

Ninety-six Angus x Hereford crossbred steers were utilized in a 2 x 3 factorial arrangement of treatments to study the relationship of levels of monensin with and without tylosin on growth rate, feed efficiency and carcass characteristics. Also, the effect of monensin on the incidence of liver abscesses and the efficacy of tylosin in controlling liver abscess production was studied. The treatment groups were: 0,100 or 300 mg monensin per head daily, and these same levels of monensin plus 75 mg tylosin per head daily. Average daily gains for the 140-day study for steers fed 0, 100 or 300 mg of monensin per head daily were 1.10,1.12 and 1.10 kg, respectively. Average daily gains of steers fed 0 or 75 mg tylosin per head daily were 1.17 and 1.04 kg, respectively, and were different (P<.05) from each other. A linear decrease (P<.01) in total dry matter intake was noted with each incremental addition of monensin to the diet. Total dry matter was also lower (P<.01) when steers fed 75 mg tylosin daily were compared to those offered no tylosin. Overall efficiency of gain was improved slightly with each increase in monensin level. Feed-to-gain ratios were higher (P<.05) in steers fed 75 mg tylosin as compared with those steers fed no tylosin. A quadratic effect (P<.05) on ribeye area was observed among monensin levels. Carcass weight was lower (P<.05) and ribeye area smaller (P<.01) in steers fed 75 mg tylosin. Of the total steers in the study, 10.4% had liver abscesses. The incidence of liver abscesses was reduced in steers fed tylosin as compared with those fed no tylosin.

¹ Department of Animal Sciences.

² This Paper (No. 77-5-160) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

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