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The effect of monensin on rumen fermentation in sheep fed on all roughage and barley roughage diets



The effect of monensin on rumen fermentation in sheep fed on all roughage and barley roughage diets



Animal Feed Science & Technology 15(1): 7-12



The effect of 50 mg of Rumensin (monensin sodium) or rumen fermentation was studied in wethers fed on all-roughage (100% hay), high-roughage (75% hay, 25% barley) and concentrated (50% hay, 50% barley) rations. Monensin significantly increased the molar proportion of propionic and isovaleric acids and decreased the proportion of acetic acid and, with the concentrated diet, the proportion of butyric acid. No significant differences were observed in total VFA, pH, ammonia and blood urea. At the time of the most intensive fermentation (1, 3 and 5 h after feeding) the proportion of propionic acid in the monensin-treated group was similar in all diets (25.0, 25.3 and 26.2%), indicating that monensin increases propionate production more with high-roughage diets than with low-roughage diets. It is concluded that the effect of monensin is greater if given in high-roughage rations and that the performance of the roughage diets could be significantly increased by monensin supplementation.

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Accession: 006649271

Download citation: RISBibTeXText

DOI: 10.1016/0377-8401(86)90033-7


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