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Palatability of Methionine Hydroxy Analog or DL-Methionine for Lactating Dairy Cows

Department of Animal Sciences University of Arizona, Tucson 85721

ABSTRACT

A decrease in grain intake occurred initially after feeding supplemental methionine hydroxy analog (top-dressed or mixed with concentrate) but top-dressing DL-methionine did not affect intakes. After initial adjustment (1 to 3 d), cows generally returned to normal grain intakes on diets supplemented with methionine hydroxy analog. Intake patterns were similar at all methionine hydroxy analog levels, which attained three to four times that recommended for supplementation. Increases in plasma free methionine at methionine hydroxy analog intakes above 40 g/d suggest bypass of additive for intestinal absorption.

¹ Monsanto Company, St. Louis, MO 63167. Agricultural Experiment Station Number 4240.

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