2000
DOI: 10.2527/jas2000.77e-suppl1s
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Insights into Conceptus-Reproductive Tract Interactions in the Pig

Abstract: A better understanding of the mechanisms mediating conceptus-reproductive tract interactions in pigs has important implications for breeding herd productivity and for understanding the effects of selection for reproductive merit on patterns of prenatal loss and associated changes in the uniformity and growth potential of offspring. Nutrition and metabolic state have an important impact on embryonic and fetal development, and there is extensive evidence for both direct and indirect effects of nutrition on the r… Show more

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Cited by 13 publications
(7 citation statements)
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References 96 publications
(105 reference statements)
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“…In earlier studies using oocyte in vitro maturation (IVM) assays, a lower proportion of oocytes recovered from previously catabolic sows reached the metaphase II stage of nuclear maturation and follicular fluid recovered from preovulatory follicles of these sows was less able to support IVM of pools of oocytes recovered from prepubertal gilts (Zak et al 1997). These results were supported by later studies linking the degree of protein catabolism in weaned sows to a decrease in the size, number and maturity of follicles at the time of weaning, and again, the ability of follicular fluid aspirated from these follicles to support IVM of standardized pools of pig oocytes (Yang et al 2000, Clowes et al 2003. As the timing of feed restriction coincides with the final stages of oocyte maturation and the establishment of methylation-dependent imprinting of the oocyte (Lucifero et al 2002, see detailed discussion below), imprinting of oocytes may be one mechanism by which catabolism in the sow affects embryonic survival and development by day 30.…”
Section: Latent Effects Of Metabolic State On Prenatal Developmentmentioning
confidence: 70%
See 1 more Smart Citation
“…In earlier studies using oocyte in vitro maturation (IVM) assays, a lower proportion of oocytes recovered from previously catabolic sows reached the metaphase II stage of nuclear maturation and follicular fluid recovered from preovulatory follicles of these sows was less able to support IVM of pools of oocytes recovered from prepubertal gilts (Zak et al 1997). These results were supported by later studies linking the degree of protein catabolism in weaned sows to a decrease in the size, number and maturity of follicles at the time of weaning, and again, the ability of follicular fluid aspirated from these follicles to support IVM of standardized pools of pig oocytes (Yang et al 2000, Clowes et al 2003. As the timing of feed restriction coincides with the final stages of oocyte maturation and the establishment of methylation-dependent imprinting of the oocyte (Lucifero et al 2002, see detailed discussion below), imprinting of oocytes may be one mechanism by which catabolism in the sow affects embryonic survival and development by day 30.…”
Section: Latent Effects Of Metabolic State On Prenatal Developmentmentioning
confidence: 70%
“…However, particularly in studies with higher parity contemporary commercial sows, increased placental efficiency does not appear to fully compensate poor placental development earlier in gestation. Even in individual gilts with 20 or more ovulations, and little or no embryonic loss by day 28-30 of gestation, substantial intra-uterine crowding limits placental development (Almeida et al 2000). Depending on the particular sow population studied, a consistent trend for increased ovulation rates in higher parity sows (Vonnahme et al 2002, Town et al 2005, Patterson et al 2008) may be associated with increased numbers of embryos (Vonnahme et al 2002, Patterson et al 2008 and negative effects on placental weight (Vonnahme et al 2002) at day 30.…”
Section: Embryonic and Placental Development Are Affected By Uterine mentioning
confidence: 99%
“…This suggests that oocyte development is likely a contributing factor to poor embryonic survival in catabolic lactating sows. However, feed-restriction can also affect the endocrine function of the pre-ovulatory follicles and differentiating corpora lutea, which in turn produce deleterious effects on the oviducal and uterine environment in which fertilisation and embryonic development take place (Foxcroft et al 2000(Foxcroft et al , 2003. In previously catabolic sows, this would intensify the competitive environment in which the already compromised embryos are expected to survive.…”
Section: Discussionmentioning
confidence: 99%
“…The period of rapid embryo elongation and communication among potential littermates to allocate available uterine space and the subsequent initiation of attachment occurs by d 13, with complete attachment over the entire surface of the conceptus by d 26 (Foxcroft et al, 2000). A rapid increase of allantoic fluid occurs between d 20 and 30 that is associated with expansion of the chorio-allantoic membranes and direct intimate contact between the placenta and endometrial surface (Knight et al, 1977).…”
Section: Relative Growth Rates Of Fetal and Placental Tissuesmentioning
confidence: 99%