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Effect of Uterine Distention on the Estrous Cycle of the Gilt¹

Iowa State University, Ames^,3

Abstract

Experimental distention of uteri by tantalum, vitallium, and plastic cylinders, glass marbles or polyvinyl alcohol sponge in 19 gilts did not modify the length of subsequent estrous cycles. Normal estrous cycles were observed in six sham-operated gilts. These results following uterine distention in the gilt are contrary to those observed by other investigators in the guinea pig, ewe and cow.

¹ Journal Paper No. J-4300 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Ia. Project No. 1325. Acknowledgment is made of support by USDHEW, PHS, NIH, A-3730; Eli Lilly and Co., Indianapolis, Ind.; Armour Pharmaceutical Co., Kankakee, Ill.; Ciba Pharmaceutical Products Inc., Summit, N. J.; and The Upjohn Co., Kalamazoo, Mich. Suggestions are appreciated from Burns George, Vanadium-Alloys Steel Co., Latrobe, Pa. Vitallium cylinders were kindly supplied by Sidney Weisman, Austenal Co., New York, N. Y. Uterine tissues were prepared for histological examination by K. Y. Chu. Technical assistance by J. W. Austin and I. D. Smith is appreciated.

² NIH Postdoctoral Fellow, 1961–1962.

³ Department of Animal Science.