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Control of Pig Reproduction VIII

Control of Pig Reproduction VIII

Maturation of The Pre-ovulatory Follicle

bp0018cpr14 | Maturation of The Pre-ovulatory Follicle | CPR2009

Nutritional and lactational effects on follicular development in the pig

Quesnel H.

In sows, follicular development is inhibited during lactation, and weaning the piglets allows recruitment and selection of follicles that will undergo preovulatory maturation and ovulate. Lactation inhibits GnRH secretion, and in turn LH secretion, through neuroendocrine stimuli induced by suckling. Pituitary response to GnRH and the sensitivity of the hypothalamo-pituitary unit to oestradiol positive feedback are also reduced. The impact of lactation on the reproductive...

bp0018cpr15 | Maturation of The Pre-ovulatory Follicle | CPR2009

Appearance, fate and utilization of abnormal porcine embryos produced by in vitro maturation and fertilization

Kikuchi K. , Somfai T. , Nakai M. , Nagai M.

In vitro production (IVP) including in vitro maturation (IVM) and fertilization (IVF) is now an important technology for obtaining live piglets. However, there are still two significant obstacles to the efficient production of viable porcine embryos: (1) polyspermy and (2) fertilization of oocytes arrested at the immature stage. These phenomena relate to production of embryos with abnormal ploidy (polyploidy). To avoid these problems, careful selection of mature oocytes ...

bp0018cpr16 | Maturation of The Pre-ovulatory Follicle | CPR2009

Intra-follicular regulatory mechanisms in the porcine ovary

Hunter TM.G. , Paradis F.

The mechanisms controlling the follicular growth continuum in the pig involve the interaction between local growth factors which are expressed throughout development and extra-follicular factors such as gonadotrophins. A large number of follicular growth factors, many belonging to the transforming growth factor-β (TGF-β) superfamily, have been identified in the somatic cells and in the oocyte. The relative importance of these intra-follicular factors varies wit...

bp0018cpr17 | Maturation of The Pre-ovulatory Follicle | CPR2009

Transcriptional, post-transcriptional and epigenetic control of porcine oocyte maturation and embryogenesis

Prather R.S. , Ross J.W. , Clay Isom S , Green J.A.

Embryogenesis is a complex process that is controlled at various levels. As new discoveries are made about molecular mechanisms that control development in other species, it is apparent that these same mechanisms regulate pig embryogenesis as well. Methylation of DNA and modification of histones regulate transcription, and mechanisms such as ubiquitinization, autophagy and microRNAs regulate development post-transcriptionally. Each of these systems of regulation is highl...