EFFECT OF MONENSIN AND A DEAMINASE INHIBITOR ON FEED UTILIZATION BY LAMBS

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Abstract
Lambs were fed monensin (Rumensin®, monensin sodium, Eli Lilly and Co., Greenfield, Ind.) and a deaminase inhibitor 4,4’-dimethyldiphenyliodonium chloride (SmithKline Animal Health Products, West Chester, Pa.) (DAI) at 33 and 25 mg/kg of diet, respectively. Digestibility and ruminal volatile fatty acids were measured using five yearling lambs per treatment. There were no treatment effects on digestibility. Molar proportions of propionic acid were 93% higher when monensin plus DAI were fed than when lambs were offered the nonmedicated control diet. Feedlot performance was measured using eighty 18-kg crossbred lambs, with two pens of 10 lambs per treatment. Lambs fed DAI consumed 8% less feed than controls, though feed to gain ratio was not affected. Gains and feed efficiency with monensin were 8% and 5% higher (P < 0.05), respectively, than control values, though feed was utilized most efficiently when both monensin and DAI were fed.

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