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Methionine Hydroxy Analog in Supplements for Lactating Beef Cows^{1 ,2,}

University of Nebraska, North Platte Station, North Platte 69101

Abstract

Three experiments were conducted to evaluate the inclusion of methionine hydroxy analog (MHA) in supplements fed to beef cows between calving (March and April) and going to pasture in mid-May. In the first experiment, two base supplements containing 13.3 and 20.4% protein were used. In the second and third experiments, one base supplement containing 13.3% protein was used. There was no improvement (P>.05) in weight gains of the cows or their calves from the feeding of MHA at levels from 2 to 15 g/head/day. The only improvement in gains resulted from the feeding of a supplement with 20.4 vs 13.3% protein in the first experiment. Improvement in reproductive performance was observed in the third experiment; 33% more (P<.05) cows that received 8 and 10 g of MHA/head/day cycled during the first 21 days of the breeding season and 40% more (P<.05) conceived during the first 30 days of the breeding season than did those that received lesser amounts of MHA.

¹ Published as paper no. 5790, Journal Ser., Nebraska Agr. Exp. Sta.

² Supported in part by a grant from E. I. duPont de Nemours and Co., Inc., Wilmington, DE 19898.