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首页> 外文会议>International Symposium on Reproduction in Domestic Ruminants >Follicle growth, corpus luteum function and their effects on embryo development in postpartum dairy cows
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Follicle growth, corpus luteum function and their effects on embryo development in postpartum dairy cows

机译：卵泡生长，语料库韧带功能及其对产后奶牛胚胎发育的影响

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Absent or irregular ovarian cycles in lactating dairy cows are caused by failure to ovulate the dominant follicle at the appropriate time. The follicle then either regresses or develops into a cyst. This process can be triggered by a variety of metabolic and disease factors that act at the hypothalamus and pituitary gland to inhibit pulsatile LH secretion and the LH surge, and at the ovary to reduce follicular growth and oestradiol production. Cows of poor energy status have low circulating concentrations of insulin-like growth factor I (IGF-I). Predisposing factors include calving difficulties, inappropriate diet, reduced intake of dry matter and a high rate of body condition score loss. Various stressors predispose the follicle to cyst developmentby inhibiting the LH surge and ovulation; these include common infections, such as mastitis. Even when ovulation does occur, poor follicular development may result in production of an inadequate corpus luteum. The timing of the increase in progesteronein the early luteal phase (days 4-5) appears to be a key determinant of fertility, probably because it alters the secretory activity of the reproductive tract, thus influencing embryonic growth and interferon-T production. A period of negative energy balance after calving can reduce fertility even though metabolic parameters have apparently improved at the time of service.
机译：哺乳乳制奶牛中的缺席或不规则的卵巢循环是由于在适当的时间而排卵中的主要卵泡而导致。然后卵泡是回归或发展成囊肿。该过程可以通过在下丘脑和垂体腺体上起作用的各种代谢和疾病因素来引发，以抑制脉动LH分泌和LH激增，并在卵巢上减少滤泡生长和雌二醇的产生。能量状况差的奶牛具有低循环浓度的胰岛素样生长因子I（IGF-I）。易感因素包括产犊困难，不适当的饮食，减少干物质的摄入量和高度的身体状况得分损失。各种压力源使囊肿抑制LH激增和排卵囊肿;这些包括常见的感染，例如乳腺炎。即使发生排卵会发生，滤泡性差的发育可能导致生产味道不足的韧带。早期患者蛋白质的增加的时间似乎是生育能力的关键决定因素，可能是因为它改变了生殖道的分泌活性，从而影响胚胎生长和干扰素-T生产。即使代谢参数在营养时显然改善了，产犊后，产犊后的负能量平衡可能会降低生育率。

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