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Ovarian and Pituitary Gland Changes in Postpartum Sows Treated with FSH¹

University of Wisconsin, Madison

Abstract

Eighteen Yorkshire and 12 Duroc primiparous sows were killed on day 6, 11 or 16 postpartum. All sows were given 20 mg. of FSH (intramuscularly) per day for the 5 days preceding slaughter, and pigs were removed from one-half of the sows for this same period. Follicular response to FSH treatment and the occurrence of new luteal structures decreased from day 6 to 16, whereas there was a trend for residual FSH activity of the pituitary gland to increase during this same period. A significant suckling-breed interaction in the analysis of new luteal tissue indicated a tendency for suckling to inhibit the occurrence of luteinization in Duroc more than in Yorkshire sows.

¹ Paper No. 1015 from the Genetics Laboratory and No 406 from the Department of Meat and Animal Science. Published with the approval of the Director of the Agricultural Experiment Station. This work was supported in part by grants from the Ford Foundation and the American Meal Institute. The FSH was furnished by the Armour Pharmaceutical Company.