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Effect of Experimental Uterine Distention on Estrual Cycle Lengths in Ewes¹

University of Wisconsin, Madison

Abstract

Plastic beads implanted in the ovine uterus on the third day post-estrus shortened the interval to next estrus or ovulation to 5 to 8 days in two of nine ewes (7 mm. beads) and three of six ewes (7+11 mm. beads). Immediate cycles were of normal length (15 to 18 days) in IS ewes which received 7 mm. beads on the eighth day postestrus. Five of 12 estrual cycles subsequently observed on the ewes treated at day-3 were shortened, as were six of 17 cycles subsequently observed on the animals treated on day-8. Ovulation without estrus was detected in two of 24 ewes treated.

¹ Paper No. 856 from the Division of Genetics and the Department of Animal Husbandry. Published with the approval of the Director of the Agricultural Experiment Station.

² Ralston Purina Fellow.

³ Present address: University of Cairo, Cairo, Egypt, U.A.R.

⁴ The authors wish to acknowledge aid in surgery given by R. A. Bellows, W. E. Collins, M. L. Gardner, A. P. Labhsetwar, J. E. Lynn, S. E. Mares, A. C. Menge, E. M. Rigor, L. W. Smith, F. Stormshak and E. W. Wickersham.