Avian eggs contain substantial amounts of maternal hormones and so provide an excellent
model to study hormone-mediated maternal effects. We review this new and rapidly evolving …

Over the past decade, birds have proven to be excellent models to study hormone-mediated
maternal effects in an evolutionary framework. Almost all these studies focus on the function …

When selection on males and females differs, the sexes may diverge in phenotype.
Hormones serve as a proximate regulator of sex differences by mediating sex-biased trait …

Eggs of vertebrates contain steroid hormones of maternal origin that may influence offspring
performance. Recently, it has been shown that glucocorticoids, which are the main …

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 …

The aim of this review is to consider the potential mechanisms birds may use to manipulate
the sex of their progeny, and the possible role played by maternal hormones. Over the past …

Within any hierarchical society, an individual's social rank can have profound effects on its
health and reproductive success,, and rank-related variation in these traits is often mediated …

Numerous researchers and institutions have been developing in ovo sexing technologies to
improve animal welfare by identifying male embryos in an early embryonic stage and …

How much effort to expend in any one bout of reproduction is among the most important
decisions made by an individual that breeds more than once. According to life-history theory …

Male birdsong has a great influence in the stimulation of female reproduction. However,
female physiological responsiveness to song may depend on the degree of complexity of …