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Compensatory Growth and Function of Luteal Tissue Following Unilateral Ovariectomy during Early Pregnancy in Pigs^{1, 2, 3,}

University of Wisconsin, Madison 53706⁵

⁵ Send reprint request to: Department of Meat and Animal Science, University of Wisconsin, Madison 53706.

Abstract

Twenty-three gilts were either unilaterally ovariectomized or subjected to sham surgery at one of two stages of pregnancy, day-4 or day-15. Blood samples were drawn from all gilts on days-1, -3 ,-5 and -7 after surgery and at slaughter on day-27 after breeding. Progestin analysis was by radioimmunoassay.

Compensatory hypertrophy of luteal tissue occurred in gilts unilaterally ovariectomized at both day-4 and day-15. Unilateral ovariectomy did not result in compensatory progestin production during the seven days following surgery at either stage, but did show compensation at slaughter on day-27. Luteal progesterone concentration did not differ between the treatment groups.

The results suggest that a 12-day interval following day-15 is sufficient for hypertrophy of luteal tissue to occur. Further, the increase in progesterone production at day-27 seen along with compensatory hypertrophy is due primarily to an increase in luteal tissue and not to an increase in progesterone production per gram of tissue.

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by Public Health Service Training Grant No. TO1-HD-00104-07, from the National Institute of Child Health and Human Development, and by the Ford Foundation, Grant No. 630-0505A.

² Paper No. 633 from the Department of Meat and Animal Science.

³ The authors wish to express their appreciation for the technical assistance of Mrs. Sho Wu and Mr. Glen Birrenkott.

⁴ Present address: Department of Physiology and Biophysics, Colorado State University, Fort Collins, 80521.