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Milk Production Response to Feeding Methionine Hydroxy Analog to Lactating Dairy Cows¹

Lipid Laborator Pennsylvania Agricultural Experiment Station University Park, Pennsylvania

P. T. Chandler

Departnfient of Dairy Science Virginia Polytechnic Institute, Blacksburg

ABSTRACT

While feeding a hydroxy methionine analog as a preventative for bovine ketosis, data were collected which indicated the analog had a stimulatory effect on milk production. Forty-two dairy cows representing four herds were divided into three treatment groups: a control and groups receiving 40 and 80 g of analog per day. Although no cow of any group evidenced ketosis, results of feeding the hydroxy methionine analog indicated a significant (P < .01) stimulatory effect on milk production. Not all breeds responded in the same marmer, as evidenced by a significant (P < .01) breed x treatment interaction.

¹ Authorized for publication as Paper no. 3449 in the Journal Series of the Pennsylvama Agricultural Experiment Station on July 30, 1968.

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