Buchanan S, Robertson G W, Hocking P M
Roslin Institute, Roslin, Midlothian EH25 9PS, UK.
Reproduction. 2001 Feb;121(2):277-85.
Ovarian production of oestradiol and progesterone was investigated in a single ovulating traditional line and a multiple ovulating male line of turkeys. The oestradiol output from small follicles in response to LH stimulation and the aromatase activity of the residual ovary were also compared. The multiple hierarchy of follicles in the male line was shown to consist of a series of follicles of a similar size and stage of physiological maturation. The follicles of the traditional line produced significantly greater quantities of oestradiol than those of the male line. Impaired oestradiol production may have resulted in the lower plasma oestradiol concentration observed in the male line. There was no difference in follicular progesterone output between the traditional-line and male-line turkeys. The oestradiol output of whole small white follicles in response to LH stimulation was similar in the two lines and the depressed steroidogenesis of the male line was not changed. The aromatase activity of the small follicles was also lower in the male line, and there was no evidence that the male line ovary produced oestradiol in quantities proportional to its size. The results demonstrated that the hierarchy of follicles in the male line consisted of groups of follicles of similar mass and hormone output and indicated that selection for increased meat yield may have resulted in reduced ovarian steroidogenesis in male-line turkeys, in comparison with traditional, unselected turkeys.
在单排卵传统品系和多排卵雄性品系的火鸡中研究了卵巢雌二醇和孕酮的产生。还比较了小卵泡对促黄体生成素（LH）刺激的雌二醇输出量以及残留卵巢的芳香化酶活性。雄性品系中卵泡的多级结构显示为由一系列大小相似且生理成熟阶段相同的卵泡组成。传统品系的卵泡产生的雌二醇量明显高于雄性品系。雌二醇产生受损可能导致雄性品系中观察到的血浆雌二醇浓度较低。传统品系和雄性品系火鸡之间的卵泡孕酮输出量没有差异。在这两个品系中，整个小白卵泡对LH刺激的雌二醇输出量相似，并且雄性品系中受抑制的类固醇生成没有改变。雄性品系中小卵泡的芳香化酶活性也较低，并且没有证据表明雄性品系卵巢产生的雌二醇量与其大小成比例。结果表明，雄性品系中卵泡的多级结构由质量和激素输出相似的卵泡组组成，并且表明与传统的、未经选择的火鸡相比，选择提高肉产量可能导致雄性品系火鸡卵巢类固醇生成减少。
