J. Anim Sci.
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J. Anim Sci. 1981. 52:794-801.
© 1981 American Society of Animal Science
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Effect of Removal of Follicles, Corpora Lutea or Ovaries on Maintenance of Pregnancy in Swine1

B. S. Nara, D. Darmadja2 and N. L. First3

University of Wisconsin, Madison 53706,4

Abstract

The effects of the removal of follicles, corpora lutea (CL) or ovaries at day 108 of gestation on maintenance of pregnancy and on concentrations of progesterone, prostaglandinCt-metabolite (PGF2{alpha}-M) and relaxin in maternal plasma were studied in 20 gilts. Controls were subjected to sham surgical procedures. Removal of CL or ovaries decreased progesterone and relaxin and increased PGF2{alpha}-M in the maternal circulation and prematurely terminated pregnancy without causing onset of lactation. Progesterone and relaxin decreased to a lower concentration after ovariectomy than after removal of CL, probably because of incomplete extirpation of luteal tissue. Ovariectomy increased the frequency of stillbirths. These results show that the CL are the main source of progesterone and relaxin in pregnant swine and that relaxin may play a role in parturition and the onset of lactation.

Footnotes

1 Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin, Madison 53706, ARS CSRS Grant No. 616-15-152; the Ford Foundation Grant No. 630-0505B.

2 Present address: Univ. of Udayana, Bali, Indonesia.

3 The authors express appreciation to Dr. O. D. Sherwood, Dept. of Physiol, and Biophys., Univ. of Illinois, for the assay of relaxin, and Drs. K. T. Kirton and U. F. Axen, the Upjohn Company, for providing the antiserum and the 13,14-dihydro-15-keto PGF2{alpha} for RIA of PGF2{alpha}-metabolite.

4 Dept. of Meat and Anim. Sci. Paper No. 734.






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Copyright © 1981 by the American Society of Animal Science.