Increased exposure to yolk testosterone has feminizing effects in chickens, Gallus gallus domesticus

Contrasting effects of increased yolk testosterone content on development and oxidative status in gull embryos

“…Third, androgens are drivers of sexual phenotypic differentiation, and can therefore participate in strategies of maternal sex allocation (e.g. Adkins-Regan et al, 2013;Navara and Mendonça, 2008;Riedstra et al, 2013;Ruuskanen and Laaksonen, 2010;Schweitzer et al, 2013).…”

Nest choice in laying hens: Effects of nest partitions and social status

“…Unlike other methods, this score takes the relative success of the opponent into account when determining the overall success of an individual (Gammell et al, 2003). The David's score has previously been used in studies on laying hens (O'Connor et al, 2011;Riedstra et al, 2013) as well as other birds (ex. Aplin et al, 2013;Bonisoli-Alquati et al, 2011).…”

In ovo testosterone treatment reduces long‐term survival of female pigeons: a preliminary analysis after nine years of monitoring

“…The specific nature of these effects depends on, among other factors, timing. For instance, both the ontogenetic stage at exposure and the time elapsed since exposure can shape a hormone's influence (Eising et al., ; Gil, ; Weinstock, ; Tobler et al., ; Riedstra et al., ). One type of pertinent early‐life experience is prenatal ( in utero or in ovo ) exposure of offspring to maternal hormones (Gil, ; Weinstock, ).…”

“…antibody production), morphology (e.g. body size and colour) and other domains can be influenced by prenatal testosterone exposure (Sockman and Schwabl, ; Pilz et al., ; Gil, ; Tobler et al., ; Riedstra et al., ). While the effects of absolute level and variability of testosterone concentration on these domains are often considered within a framework of Darwinian fitness (Eising et al., ; Groothuis and Schwabl, ), effects on more‐integrative proxies, for example nestling survival (Sockman and Schwabl, ; Pilz et al., ), are also sometimes reported.…”

“…A few studies examine the relationship between egg androgens and recruitment into local breeding populations, but the results are mixed (Tschirren et al., ; Hegyi et al., ; Ruuskanen et al., ). Other studies that include measurements beyond the period of post‐natal development and into the period of sexual maturity in males and females generally relate to the long‐lasting organizing effects of testosterone on behaviour, physiology, immunology and secondary sexual differentiation (Gil, ; Groothuis and Schwabl, ; Goerlich et al., ; Riedstra et al., ). For example, Tobler et al.…”