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Changes in pituitary responsiveness during the ovulatory cycle of the Japanese quail, in vitro

✍ Scribed by Connolly, Peter B. ;Callard, Ian P.

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 533 KB
Volume: 247
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402470209

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✦ Synopsis

Anterior pituitary glands from ovulating Japanese quail (Coturnix coturnix) were used to investigate variation in sensitivity to chicken luteinizing hormone-releasing hormone (cLHRH I; Gln8-LHRH). Grouping the pituitaries by ovulatory stage provided preliminary evidence of changes in sensitivity to LHRH during the ovulatory cycle. Pituitaries taken from quail before the preovulatory LH surge were responsive to cLHRH I, while pituitaries from the other times of the cycle showed minimal response to cLHRH I. Female pituitary glands release less LH than those of males. These data indicate a change in sensitivity to LHRH in the female quail that may be due to changes in gonadal steroids or the pool of releaseable LH from the pituitary.

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