Increased exposure to yolk testosterone has feminizing effects in chickens, Gallus gallus domesticus
نویسندگان
چکیده
منابع مشابه
Sex differences in yolk hormones depend on maternal social status in Leghorn chickens (Gallus gallus domesticus).
Maternal hormones are known to be present in avian eggs and can have beneficial effects on chick development. Recently, differences in avian yolk steroid concentrations between the sexes have been demonstrated, and in this context steroids have been proposed to be part of the avian sex-determining mechanism. In our study, we show that it is very unlikely that androgen concentrations alone are t...
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Objective- To evaluate the total toxic dose of lidocaine and serum lidocaine concentrations resulting in clinical signs of toxicity in chickens. Design- Experimental study Animals- Eight healthy, female, 55-week-old chickens (Lohman breed) weighing 1.45 ± 0.17 kg (mean ± SD) Procedure- A loading dose of 2% lidocaine (4 mg/kg) was administered IV, followed by a constant-rate infusion at a dose o...
متن کاملClinical and acquired immunologic responses to West Nile virus infection of domestic chickens (Gallus gallus domesticus).
Numerous bird species are highly susceptible to North American strains of West Nile virus (WNV), and although domestic chickens are relatively resistant to WNV-associated disease, this species currently represents the most practical avian model for immune responses to WNV infection. Knowledge of the immunomodulation of susceptibility to WNV in birds is important for understanding taxonomic diff...
متن کاملMobilization of ectopic yolk in Gallus gallus domesticus: a novel reverse lipid transport process.
In many oviparous animals, bursting type atresia of ovarian follicles occurs during the reproductive cycle, resulting in the escape of yolk into the extracellular compartment. In birds, this ectopic yolk is rapidly cleared by an unknown process that involves the appearance of yolk-engorged macrophage-like cells. To study this unique type of lipid transport, we injected young male chickens intra...
متن کاملANG II and baroreflex control of heart rate in embryonic chickens (Gallus gallus domesticus).
ANG II alters the short-term blood pressure buffering capacity of the baroreflex in many adult animals. In embryonic chickens, high plasma ANG II levels contribute to baseline mean arterial pressure (MAP, kPa) without changing heart rate (ƒH, beats/min). We hypothesized, on the basis of these features, that an ANG II-induced reduction in baroreflex sensitivity is present in embryonic chickens a...
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ژورنال
عنوان ژورنال: Animal Behaviour
سال: 2013
ISSN: 0003-3472
DOI: 10.1016/j.anbehav.2013.01.011