Evidence for and implications of follicular heterogeneity in pigs.

M. Hunter, T. Więsak
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引用次数: 73

Abstract

Follicular heterogeneity has been demonstrated in both naturally cyclic and PMSG-stimulated immature gilts in that follicles in the selected ovulatory population differ in size by up to 2 mm and show marked variability in steriod content and gonadotrophin binding ability. This biochemical and morphological asychrony continued into the immediate preovulatory phase and changes in response to the LH surge did not always occur simultaneously even in the same follicle or in all follicles within an ovary. It is suggested that these differences in follicular maturation immediately before ovulation may result in heterogeneity in the population of corpora lutea. Following oestrus or hCG administration, oocyte maturation was again not completely synchronous in all follicles within an animal. It is proposed that follicular heterogeneity has implications for oocyte maturation and early embryonic development.
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猪卵泡异质性的证据和意义。
卵泡异质性已在自然循环和经pmsg刺激的未成熟后备母猪中得到证实,在选定的排卵群体中,卵泡的大小差异可达2毫米,并且在类固醇含量和促性腺激素结合能力方面表现出明显的差异。这种生化和形态上的不同步一直持续到排卵前阶段,即使在同一个卵泡或卵巢内的所有卵泡中,对LH激增的反应也并不总是同时发生。这表明,排卵前卵泡成熟的这些差异可能导致黄体种群的异质性。在发情期或给药hCG后,在动物的所有卵泡中,卵母细胞成熟也不是完全同步的。卵泡异质性与卵母细胞成熟和早期胚胎发育有关。
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Consequences of variation in interval from insemination to ovulation on fertilization in pigs. Role of prolactin in the regulation of ovarian function in pigs. Manipulation of gametes and embryos in the pig. Hypothalamic control of gonadotrophin and prolactin secretion in pigs. Control of follicular development and ovulation rate in pigs.
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