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Peripheral plasma progesterone during egg transport in the rabbit
Summary
In rabbits, progesterone levels surge after mating or hCG injection, peaking before ovulation. Post-ovulatory progesterone increases influence egg transport through the oviduct.
Area of Science:
- Reproductive Endocrinology
- Mammalian Reproduction
Background:
- Progesterone plays a critical role in mammalian reproduction.
- Understanding the temporal dynamics of progesterone secretion is crucial for reproductive success.
Purpose of the Study:
- To investigate peripheral plasma progesterone concentrations in relation to ovulation and early embryonic development in rabbits.
- To determine the influence of progesterone secretion on egg transport through the oviduct.
Main Methods:
- Peripheral plasma progesterone was measured every 6 hours in New Zealand rabbits.
- Measurements were taken before and up to 96 hours after natural mating, hCG injection, or saline injection.
- Ovulation points were assessed in mated and hCG-injected animals.
Main Results:
- No significant difference in ovulation points between natural mating and hCG injection.
- A progesterone surge was observed following both mating and hCG injection, peaking before ovulation.
- A significant post-ovulatory increase in progesterone began around 30 hours after ovulation induction, correlating with egg movement into the oviductal isthmus and uterus.
Conclusions:
- Progesterone secretion dynamics are closely linked to ovulation and early reproductive events in rabbits.
- The post-ovulatory rise in progesterone appears to influence the transport of eggs through the oviductal isthmus.