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Effect of Monensin on Total Volatile Fatty Acid Production by Steers Fed a High Grain Diet^1,2,

University of Arizona, Tucson 85721

Abstract

Four rumen-fistulated steers, averaging 315 kg during two experimental periods were used in a replicated 2 x 2 Latin square study designed to determine the effects of monensin supplementation on rumen volatile fatty acid (VFA) production, pH and liquid volume. A 72% steam-flaked, sorghum grain diet was fed twice daily at 0700 and 1700 h at 2.0% of live body weight. Production rate were determined at 11 times during a 24-h feeding cycle by short-term in vitro incubations of whole rumen contents. Momensin increased moles/100 mol (P<.05) and production rate (µmoles·; liter^–1 · min^–1; P>.01) of propionate and depressed moles/100 mol (P<.01) and production rate (P<.05) of butyrate. Moles of acetate/100 mol were no affected (P>.05) by monensin. Daily propionate production (moles) was increased (P<.01) by 37% by monensin. Monensin increased total production of acetate (11%) and total VFA production (16%), both nonsignificantly. Both rumen pH and liquid volumes were increased nonsignificantly by monensin.

¹ Arizona Agr. Exp. Sta. Journal Article 3213.

² This paper is part of a dissertation prepared by the senior author in partial fulfillment of the requirements for the Ph.D. degree in Agr. Biochem. and Nutr.

³ Present address: Ralston Purina Co., Lincoln. NE.