Endocrinology of Pregnancy
Endocrinology of Pregnancy
Gravidity - oviparous species
? retain egg for species specific period ? time defined by:
? length of shelling process ? oviposition timed to environmental event
? oviposition is under control of mother
Oviparous reptiles
? Egg retention associated with corpus luteum activity
? remove CL early in gravidity and spontaneous oviposition (e.g., lizards.snakes)
? at ovulation, CL formed by luteinization of granulosa and thecal cells
CL & Progesterone
? surge in progesterone observed
? remains elevated in some species ? others it is elevated only at ovulation
Post-ovulation
? movement of egg down reproductive tract associated with synthesis of PGF2
? activity present for short period ? period of albumen and shell fiber secretion ? associated with -adrenergic stimulation
? oviduct contraction then becomes quiescent
? inhibition of -adrenergic stimulation ? PG synthesis
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