Understanding ovarian function in pigs

Description

This chapter summarizes the basic physiology of porcine female reproduction, including: ovarian structure and function, ovarian follicle development (folliculogenesis), the role of the corpus luteum in the establishment and maintenance of pregnancy, biosynthesis of steroid hormones (steroidogenesis) and the role of the hypothalamic-pituitary-gonadal (HPG) axis in regulating reproduction. It also describes stages of the porcine estrous cycle as well as puberty and gilt development. The chapter goes on to discuss a range of environmental factors which can impair reproductive performance, including the effects of pesticide residues and mycotoxins. Finally, the chapter reviews research on the way heat stress can affect porcine female reproductive function.

Table of contents

• 1 Introduction
• 2 The ovary: structure and function
• 3 Follicle development: folliculogenesis
• 4 The corpus luteum
• 5 Ovarian steroidogenesis and steroid hormone changes during late gestation
• 6 The hypothalamicpituitarygonadal axis
• 7 The estrous cycle in swine
• 8 Puberty and gilt development
• 9 Environmental factors impairing swine reproduction: pesticide residues
• 10 Environmental factors impairing swine reproduction: mycotoxins
• 11 Environmental factors impairing swine reproduction: other endocrine-disrupting chemicals
• 12 Environmental factors impairing swine reproduction: heat stress
• 13 Conclusion
• 14 References