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- W1784173640 abstract "Publisher Summary This chapter discusses the physiology, ecology, and behavior of hormones in avian eggs. The main source of hormones found in avian eggs is the maturing follicles of the female ovary that contain specialized cells creating different hormones during their development. The granulosa cells of the largest preovulatory follicles (F1) are the main source of circulating progesterone. Theca cells produce both estrogen and androgens, and the production decreases with increasing follicular maturation. Postovulatory follicles continue to produce steroids before final atresia, and their low androgen production during incubation is brought about by a decrease in luteinizing hormone stimulation rather than by a reduction of the steroidogenic capacity of the theca interna cells at that stage. Although sexual differentiation takes place in the early embryo by the means of processes based on estradiol, the development of sexually selected characters in birds is tightly linked to hormonal processes in adulthood, of both androgenic and estrogenic nature. While within‐brood distributions of yolk androgens can be highly species‐specific, many differential patterns can be found within the same species. Given the effects of androgens in chick competitiveness, females could use within‐clutch distributions of androgens to balance or reinforce the effects of hatching asynchrony." @default.
- W1784173640 created "2016-06-24" @default.
- W1784173640 creator A5045311344 @default.
- W1784173640 date "2008-01-01" @default.
- W1784173640 modified "2023-10-12" @default.
- W1784173640 title "Chapter 7 Hormones in Avian Eggs: Physiology, Ecology and Behavior" @default.
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