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Effect of Surgical Separation of Uterus and Ovaries on Estrous Cycle Length in Swine^{1, 2, 3,}

University of Wisconsin, Madison 53706

Abstract

The importance of the vascular connections between the ovaries and uterine horns in the control of the lifespan of the corpora lutea was studied in 21 nulliparous crossbred gilts. Partial or total ligation of the blood vessels with surgical separation of the two organs was carried out at day 9 of the estrous cycle (estrus = day 0), and the gilts were autopsied at the first post-treatment estrus. Separation of the uterus from the ovaries did not prevent the normal regression of the corpora lutea and the subsequent occurrence of estrus.

Follicular development as judged by follicular fluid weight and the number of follicles of 3 to 6 mm and 7 to 10 mm diameter was normal.

The treated gilts in the partial and total isolated groups did not differ significantly (P > .05) from the sham laparotomized in any of the following characteristics studied: estrous cycle length, ovarian weight, corpora lutea weight and follicular development.

¹ This investigation was partially supported by Public Health Service Training Grant 5-T-1HD00104-04 from the National Institute of Child Health and Human Development and The Ford Foundation Grant 630-0505A.

² Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison 53706 and Fundaçao Ford do Brasil.

³ Department of Meat and Animal Science Paper No. 645.

⁴ Permanent address: Departamento de Zootecnia, Universidade Federal de Viçosa-Viçosa-Minas Gerais, Brasil.