Like most vertebrates, birds have two forms of @entity1176 (GnRH). @entity1573 @entity1574 ( @entity1574 ) is released at the median eminence to elicit gonadotropin release; @entity1573 @entity69841 (cGnRH-II) is thought to be non-hypophysiotropic and its function is unclear. Both forms are hypothesized to act as neurotransmitters in the control of reproductive behavior. In the present study, we implanted chronic cannulae aimed at the third ventricle in female white-crowned sparrows (Zonotrichia leucophrys gambelii) to test the effects of both forms of @entity1176 on copulation solicitation, a female courtship behavior. This behavior can be elicited in captive, @entity172 -primed females by playing a recording of male song. We quantified the behavioral response to recorded song 30, 60, and 90 min after intracerebroventricular infusion of @entity1574 , -II, or saline. cGnRH-II, but not @entity1574 , increased solicitation behavior compared with saline 30 min after infusion. Under control conditions, responses to the playback diminish from the 30-min to the 90-min time point. Responses after cGnRH-II infusion followed a similar pattern, whereas after @entity1574 , there was no significant response decrement. @entity1574 appears to maintain the level of solicitation seen at 30 min after infusion. Our results suggest a behavioral role for cGnRH-II that may be independent of @entity1574 .

Central administration of XXXX gonadotropin-releasing hormone-II enhances courtship behavior in a female sparrow.

@entity172 :: ('MESH:D004967', 'Chemical') :: ['estrogen'] @entity1573 :: ('9031', 'Species') :: ['chicken', 'Chicken'] @entity69841 :: ('426561(Tax:9031)', 'Gene') :: ['GnRH-II'] @entity1176 :: ('MESH:D007987', 'Chemical') :: ['GnRH', 'gonadotropin-releasing hormone'] @entity1574 :: ('770134(Tax:9031)', 'Gene') :: ['GnRH-I', 'cGnRH-I']
@entity1573 :: (9031,Species) :: ['chicken']
