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Ovarian Activity in Ewes Treated with Glucose and Triiodothyronine¹

University of Wisconsin, Madison

Abstract

Thirty-two mature, white-faced western ewes were studied in a 2² factorial experiment of one estrous cycle duration. The factors studied were the feeding of glucose and the administration of triiodothyronine (T₃). Both treatments were effective in elevating the blood glucose level. Treatment with T₃ caused a loss in body weight; the greatest loss occurred in the T₃-treated, glucose-fed ewes. The estrous cycle was longer for animals on T₃ treatment. Both glucose alone and T₃ alone appeared to depress follicular development. No difference in follicular activity from the controls was observed when both treatments were used together.

¹ Paper No. 1075 from the Genetics Laboratory and No. 444 from the Department of Meat and Animal Science. Published with the approval of the Director of the Agricultural Experiment Station. This investigation was supported in part by a grant from the Ford Foundation and in part by Public Health Service Training Grant No. 1 T1 HD 104-01, from the National Institute of Child Health and Human Development.