Photoperiod affects the morphology of a sexually dimorphic nucleus within the preoptic area of male Japanese quail
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Circannual cycles and photoperiodism
2022, Sturkie's Avian PhysiologyCircannual Cycles and Photoperiodism
2015, Sturkie's Avian Physiology: Sixth EditionAromatase expression in the brain of the ruffed grouse (Bonasa umbellus) and comparisons with other galliform birds (Aves, Galliformes)
2013, Journal of Chemical NeuroanatomyCitation Excerpt :Based on the differences in courtship among these three species, we specifically predicted that the ruffed grouse would have higher aromatase expression than the quail or spruce grouse in the arcopallium and the anterior hyperpallium of the telencephalon because of their respective roles as premotor regions (Davies et al., 1997; Feenders et al., 2008; Reiner et al., 2005; Zeier and Karten, 1971). In addition, aromatase expression in the avian brain is not static and varies with the reproductive condition of the individual (Panzica et al., 1987, 1991, 1996a,b; Riters et al., 2000; Thompson and Adkins-Regan, 1994; Viglietti-Panzica et al., 1986). Therefore, we also predicted that there will be more ARO neurons and they will be larger in male ruffed grouse collected in the breeding season compared to the non-breeding season.
Sexual differentiation of brain and behavior in birds
2009, Hormones, Brain and Behavior OnlineTopography in the preoptic region: Differential regulation of appetitive and consummatory male sexual behaviors
2007, Frontiers in NeuroendocrinologyCitation Excerpt :Quail display several features that facilitate the identification of the neural circuitry controlling copulation. The volume of the medial preoptic nucleus (POM; illustrated in Figs. 1 and 2A) in this species is larger in males than in females [146] and interestingly co-varies with circulating levels of testosterone: it is reduced by castration or exposure to short daylengths (simulating winter conditions of low testosterone concentrations) and increases following treatment with exogenous testosterone or exposure to long days which increase testicular activity [101,139]. The size of neurons in the lateral part of the POM is similarly controlled by plasma testosterone concentrations [103] being larger in the presence than in the absence of testosterone.