PMID: 1194828Oct 1, 1975Paper

Changes in plasma concentrations of luteinizing hormone after injection of progesterone at various times during the ovulatory cycle of the domestic hen (Gallus domesticus)

The Journal of Endocrinology
S C Wilson, P J Sharp

Abstract

Changes in plasma LH concentrations after i.m. injections of 0-5 mg progesterone/kg at various stages of the ovulatory cycle were measured by radioimmunoassay. Four types of response were observed. (1) When the steroid was injected between 4 h after and 12 h before an ovulation, LH levels started to rise after 15--45 min and reached peak values within 90--120 min. The mean maximal incremental change in the level of LH was 1-58 +/- 0-10(S.E.M.) ng/ml (n = 37). (2) In contrast, when progesterone was injected 12--8 h before ovulation, i.e. immediately before a spontaneous pre-ovulatory LH surge, the resulting mean maximal incremental change in LH level, 0-79 +/- 0-12 ng/ml (n = 9), was significantly smaller (P less than 0-001). (3) If progesterone was injected 8--4 h before ovulation, i.e. when pre-ovulatory LH levels were rising, they immediately started to rise more rapidly and reached peak values within 45 min. The maximal incremental change in the level of LH under these circumstances, 2-34 +/- 0-20 ng/ml (n = 12), was significantly greater (P less than 0-001) in both cases) than the changes observed in the responses 1 and 2 described above. (4) Levels of LH generally showed no incremental change in response to injections of p...Continue Reading

Citations

Sep 1, 1990·The Journal of Steroid Biochemistry and Molecular Biology·J P WiebeF Hertelendy
Sep 1, 1980·British Poultry Science·S C Wilson, F J Cunningham
Jun 1, 2006·Reproduction : the Official Journal of the Society for the Study of Fertility·P L RangelC G Gutierrez
May 1, 1978·General and Comparative Endocrinology·S C Wilson, L Lacassagne
Jan 1, 1978·General and Comparative Endocrinology·C G ScanesN J Bolton
Dec 1, 1984·The Journal of Experimental Zoology·F J CunninghamR T Gladwell
Dec 1, 1984·The Journal of Experimental Zoology·J M Bahr, A L Johnson
Aug 1, 1988·The Journal of Experimental Zoology·P B Connolly, I P Callard

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