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Monensin and Extruded Urea-Grain for Range Beef Cows^_1,2,

Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

The supplemental value of monensin with extruded urea-grain and soybean meal supplements for cows grazing low quality dry winter range grass was evaluated in two trials. Cows wintered on 30% soybean meal-based supplements lost less weight (P<.05) than cows receiving either extruded urea-grain or 15% soybean meal-based supplements. Cow weight change was not significantly affected by the addition of monensin. Cattle losing the most weight also lost the most condition as appraised visually.

Monensin feeding did not statistically alter total ruminal nitrogen, ammonia, non-ammonia nitrogen, sodium or total ruminal VFA concentrations. However, molar proportion of acetate and butyrate were decreased (P<.05), and propionate was increased (P<.05) in both trials when monensin was fed. Ruminal potassium concentration also was increased (P<.05) in trial 1 when monensin was fed.

^₁ Journal article 3385 of the Agricultural Experiment Station, Oklahoma State University, Stillwater.

^₂ The research reported herein was partially supported by a grant from Lilly Research Laboratories Division of Eli Lilly and Company, Greenfield, IN, and Far-MarCo., Inc., Hutchinson, KS.

³ Present address: Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.

⁴ Department of Animal Science.

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