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首页> 外文期刊>The Journal of Experimental Biology >Effects of exogenous 17#beta#-estradiol on the reproductive physiology and reproductive performance of european starlings (Sturnus vulgaris)
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Effects of exogenous 17#beta#-estradiol on the reproductive physiology and reproductive performance of european starlings (Sturnus vulgaris)

机译：外源17＃β＃-雌二醇对欧洲八哥（Sturnus vulgaris）生殖生理和生殖性能的影响

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摘要

Egg mass shows large intraspecific variation in birds and yet the mechanisms underlying this variation remain unknown. We hypothesized that estradiol would play a central role in determining egg mass, since this hormone stimulates the production of yolk precursors (vitellogenin and very-low density lipoprotein, VLDL)by the liver, and of albumen by the oviduct. We gave European starlings(Sturnus vulgaris) silastic implants containing estradiol prior to egg formation, which we predicted would increase egg mass. As expected, exogenous estradiol stimulated a marked (49 %) increase in plasma vitellogenin levels at the beginning of laying. At clutch completion, plasma VLDL levels and oviduct mass were also elevated in estradioltreated females compared with controls. However, estradiol had no effect on fresh egg mass or clutch size. Estradioi treatment actually decreased the mass of yolk protein and lipid, Perhaps by decreasing the rate of uptake of yolk precursors at the ovary. The failure of estradiol to increase egg mass indicates that this phenotype may be regulated at higher levels of organization (e.g. negative feedback, uptake of yolk precursors) than those studied in this experiment. Despite elevating yolk precursor levels, treatment with estradiol had no effect on the mass of theliver or endogenous stores of protein and lipid at clutch completion.
机译：鸡蛋的质量在禽类中显示出较大的种内变异，但这种变异的潜在机制仍然未知。我们假设雌二醇将在确定卵子质量中起核心作用，因为该激素刺激肝脏产生卵黄前体（玻璃体素和极低密度脂蛋白，VLDL），并通过输卵管产生白蛋白。我们在卵形成前给欧洲八哥（Sturnus vulgaris）含雌二醇的硅橡胶植入物，我们预测这会增加卵的质量。如预期的那样，在开始产蛋时，外源雌二醇刺激血浆卵黄蛋白原水平显着增加（49％）。离体完成时，与对照组相比，雌二醇治疗的女性血浆VLDL水平和输卵管质量也升高。但是，雌二醇对新鲜鸡蛋的质量或离合器的大小没有影响。雌二醇的治疗实际上减少了卵黄蛋白和脂质的质量，也许是通过降低卵巢中卵黄前体的摄取速率来实现的。雌二醇不能增加蛋重表明该表型可能比本实验研究的更高（例如负反馈，蛋黄前体的摄取）。尽管蛋黄前体水平升高，雌二醇处理对离体完成时肝脏或蛋白质和脂质的内源性贮藏量没有影响。

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