Abstract
The hypothalamic-pituitary-ovarian (HPO) axis is the key regulator of female reproductive functions. HPO axis integrates internal and external signals to coordinate reproductive functions through the neuroendocrine network. Gonadotropin-releasing hormone (GnRH) plays a central role in the HPO axis to control pituitary gonadotropin secretion and ovarian steroidogenesis. The ovarian steroids, particularly estradiol regulate GnRH secretion through the negative feedback mechanism. At the initiation of puberty, the negative feedback of estradiol decreases, leading to activation of the GnRH surge centre and commencement of the estrous cycle, growth of the follicles, and ovulation. The estrous cycle divides into four distinct stages: estrus, proestrus, metestrus, and diestrus. The follicles’ development started during the foetal life and continued through a dynamic process during various phases of post-natal periods called folliculogenesis. Rhythmic alterations of follicular dynamics occur during each estrous cycle after puberty. The maturation of the female gamete, the ovum, is completed after puberty which is subsequently released from the matured or Graafian follicles at the end of estrus, followed by the formation of corpus luteum (CL). The metestrus and diestrus stage is under the control of progesterone secreted from CL. The CL undergo lysis if the animals fail to conceive by prostaglandin F2α (PGF2α) secreted from the endometrium. Successful conception prevents the release of PGF2α, and the CL is sustained throughout the pregnancy. The reproductive cycles of females are species specific and are controlled by several factors like environmental cues, photoperiod, nutritional state, stress, and diseases. This chapter encompasses the integrated neuroendocrine and molecular mechanisms involved in different aspects of female reproduction, such as initiation of puberty, ovarian steroidogenesis, oogenesis, and folliculogenesis, including ovulation in domestic, wild animals, and birds.
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Das, P.K., Mukherjee, J., Banerjee, D. (2023). Female Reproductive Physiology. In: Das, P.K., Sejian, V., Mukherjee, J., Banerjee, D. (eds) Textbook of Veterinary Physiology. Springer, Singapore. https://doi.org/10.1007/978-981-19-9410-4_22
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DOI: https://doi.org/10.1007/978-981-19-9410-4_22
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