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Exp Clin Endocrinol Diabetes 1991; 98(4): 3-8
DOI: 10.1055/s-0029-1211093
Original

© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

Evidence for Relaxin and Progesterone Synchronous Secretion on Days 13 to 17 of the Oestrous Cycle in Sows1)

Genowefa Kotwica, Luiza Dusza, Renata Ciereszko, S. Okrasa, D. Schams*
  • Institute of Animal Physiology (Head: Prof. Jadwiga Przala), University of Agriculture and Technology, Olsztyn-Kortowo/ Poland
  • * Institut für Physiologie, Südd. Versuchs- und Forschungsanstalt für Milchwirtschaft (Head: Prof. H. Karg). Technische Universität München, Freising-Weihenstephan/Germany
1) This research was supported by the Ministry of Science and Higher Education of Poland (C.P.B.P.05.06.1)
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Publication History

1990

Publication Date:
16 July 2009 (online)

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Summary

Concentrations of relaxin in both the utero-ovarian vein (UOV) and jugular vein (JV) as well as those of progesterone and prostaglandin F2α in the UOV were studied on Days 13 — 17 of the oestrous cycle in sows. Mean relaxin plasma concentrations in the UOV and JV were correlated (r= 0.55; P<0.001) and were significantly higher (P<0.01) in the UOV (1.67 ± 0.07 ng/ml), than in the JV (0.59 ± 0.1 ng/ml). The great similarity between relaxin and progesterone profiles was ascertained (r = 0.57; P < 0.001). The steep decrease of progesterone plasma concentration on the day of luteolysis was observed together with synchronous relaxin concentration decline. A significant correlation between relaxin and PGF2α plasma concentration was demonstrated one day before luteolysis (r = 0.41; P < 0.001).

Conclusions. (1) The corpus luteum in swine secretes relaxin to the UOV at the time of late luteal phase of the oestrous cycle; (2) The significant correlation between relaxin and progesterone concentrations points to similar regulation of their secretion during luteal regression connected to the oestrous cycle.

Key words

Relaxin - Progesterone - Luteolysis - Sows