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Effect of Progestins on Lactation in the Ewe¹

West Virginia University, Morgantown

Abstract

Milk production by a total of 51 lactating Hampshire ewes treated either with pessaries containing no progestin or pessaries containing progestin was studied. The ewes were milked three times as follows: at the time of insertion of pessaries (day 0), removal of pessaries (day 14) and 7 days after removal of pessaries (day 21) during 2 consecutive years. Milk yields were obtained at a time when the ewes were near peak milk production. Neither of the two progestins studied, MAP or flurogestone acetate, had a significant effect on milk yield or on change in milk yield from one milking to the next within a year. There was a significant effect (P<.05) of year on change in milk yield from the day 0 to day 21.

¹ Published with the approval of the Director of the Agricultural Experiment Station as Scientific Paper No. 1091. Supported in part by project Hatch 297.

² MAP was provided by Dr. R. G. Zimhelman and Dr. J. W. Lauderdale, The Upjohn Company, Kalamazoo, Michigan. Flurogestone acetate was provided by Dr. G. E. Short, G. D. Searle and Co., Chicago, Illinois.