lecture_10-1-2

lecture_10-1-2 - processes, so levels of hormones are...

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control of female reproductive behavior Females have reproductive stages just as males do: Egg-laying Incubation Maternal care Incubation and maternal care are absent in polyandrous groups There are two main behaviors associated with courtship and nestings: Nest-building Copulation solicitation displays Both are estrogen-dependent Again, we have the HPG axis, this time involving the single ovary in the female instead of the testes in the male. In particular, sex steroids in the females are synthesized and released by growing ovarian follicles within the ovary. Supportive cell layers called the granulosa and theca layers produce: Progesterone Estrogen Androgens (including testosterone, dihydrotestosterone, androstenedione) Each of these hormones is synthesized from a cholesterol molecule. Parts of the cholesterol molecule are cleaved to yield different steroid structures,that have different functions. The hormones are formed from one another through cleavage
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Unformatted text preview: processes, so levels of hormones are interrelated: Cholesterol & Progesterone & Testosterone & Estrogen We can again characterize sex steroids in the female in a similar seasonal manner as with the male – sex steroids are highest during the breeding season and at lower levels at all other times. If we focus on only the breeding season, we see that there is an intrinsic pattern of hormone production that, in the female, is tightly linked to egg production. This tight dependence of egg-production on hormone concentrations is why female sex steroid concentrations are so much more tightly correlated to all reproductive stages, while the male is less so. During the ovulatory process, estrogen, testosterone, and progesterone contribute to follicular maturation and ovulatory processes. All three peak about 4h before ovulation....
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This note was uploaded on 04/08/2011 for the course POUL 3123 taught by Professor Navara during the Spring '09 term at UGA.

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lecture_10-1-2 - processes, so levels of hormones are...

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