lecture 3 2011

lecture 3 2011 - Lecture 3 Hypothalamic-pituitary-gonadal...

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Lecture 3
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Hypothalamic-pituitary-gonadal axis GnRH = gonadotropin releasing hormone FSH = follicle stimulating hormone LH = luteinizing hormone
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Cues for reproduction GnRH
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Reproductive Cues: General Reproduction: production of young only when survival rate is maximum In times of undernourishment the reproductive axis is suppressed and puberty is delayed Evolutionary pressure to develop mechanisms for regulating body weight are considerable Obese Too thin
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Cues for Reproduction in Birds Long-term: light Medium-term: nutrition and territory Short-term: mate, nest site Temperate versus tropical birds
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Puberty Massive seasonal growth of reproductive organs Cost of flight For both animals and birds, GnRH synthesizing capacity is present and is activated during puberty. In birds, the GnRH cycle is reactivated each reproductive season. Puberty can be induced early with GnRH
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lecture 3 2011 - Lecture 3 Hypothalamic-pituitary-gonadal...

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