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Journal of Dairy Science Vol. 57 No. 6 695-697
© 1974 by American Dairy Science Association ®
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Effect of Methionine Hydroxy Analog Feeding on Yield and Composition of Bovine Milk1

H. H. Olson and W. R. Grubaugh2

Department of Animal Industries, Southern Illinois University, Carbondale, Illinois 62901

ABSTRACT

Four percents of methionine hydroxy analog were fed to 36 lactating Holstein cows in a switch-back experiment of four treatments. The analog contents of the four grain mixtures for treatments I, II, III, and IV were 0. .3, .4, and .5%. The basal ration of corn silage and hay was group-fed ad libitum. Means of the respective treatments were: analog intake 0, 16.59, 23.20, 27.85 g/day and fat-corrected milk 15.8, 16.0, 16.2, 16.1 kg/day. No advantage was found from feeding analog as measured by milk yield, milk fat, or solids-not-fat. No differences were significant among treatments for fatty acid composition of the milk fat.

FOOTNOTES

1 This project was supported in part by a grant from Monsanto Co., St. Louis, Missouri.

2 Present address: Wiley Grubaugh, Heifer Project, Inc., Casilla 432, Santa Cruz, Bolivia.






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Copyright © 1974 by the American Dairy Science Association ®.