The Effect of Uterine Environment on Meishan and Yorkshire Fetal Development and Placental Size and Vascularity
dc.contributor.author | Wilson, Matthew | |
dc.contributor.author | Biensen, Nina | |
dc.contributor.author | Ford, Stephen | |
dc.date | 2018-02-13T00:17:31.000 | |
dc.date.accessioned | 2020-07-02T07:00:24Z | |
dc.date.available | 2020-07-02T07:00:24Z | |
dc.date.copyright | Fri Jan 01 00:00:00 UTC 1999 | |
dc.date.embargo | 2012-08-18 | |
dc.date.issued | 1999 | |
dc.description.abstract | <p>When Meishan (M) and Yorkshire (Y) embryos were cotransferred to Y recipients that were then allowed to farrow, it was observed that the birth weights of M and Y littermates were similar averaging 1.15 ± .06 kg. In contrast, placentae matched to M piglets were markedly smaller (.70% lighter) and more vascular (.two-fold) than Y placentae. To investigate the effect of uterine environment on conceptus development to term, M and Y embryos were cotransferred to M recipients (n=3) that were slaughtered one day before expected parturition (day 113). Fetal weight, placental weight, and placental surface area were recorded. Additionally, a section of the intact maternal placental interface was excised, fixed, embedded, sectioned, and stained to allow quantitation of the placental vascular density (PVD). As observed when M and Y fetuses were cogestated by Y recipients, littermate M and Y fetuses gestated in M uteri were similar in weight (1.04 ± .03 vs. 1.03 ± .05 kg) at term. Further, M conceptuses exhibited markedly reduced (P<.03) placental weights (170 ± 19 vs. 249 ± 10 g) and surface areas (1017 ± 70 vs. 1506 ± 96 cm 2 ) compared with their Y littermates. As was the case for conceptuses gestated in Y uteri, the similarity in fetal weight between the two breeds with very different placental sizes appears to result from an increased (P<.09) M PVD compared with littermate Y fetuses (2.5 ± .3 vs. 1.4 ± .4%). These data indicate that in both the M and Y uterine environment, the reduced size of the M compared with Y placenta is compensated for by an increase in PVD. Currently it is unknown whether M placentae contain a greater amount of vasculature (total volume) or a similar amount of vasculature simply squeezed into a smaller space. To investigate breed differences in total placental vasculature we have perfused placentae of M and Y conceptuses cogestated in M uteri on d 113 of gestation with vascular casting material and will compare the volumes of the corrosion casts.</p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/swinereports_1998/21/ | |
dc.identifier.articleid | 1018 | |
dc.identifier.contextkey | 3232463 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | swinereports_1998/21 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/91114 | |
dc.language.iso | en | |
dc.relation.ispartofseries | Animal Science Research Reports | |
dc.relation.ispartofseries | ASL R1570 | |
dc.source.bitstream | archive/lib.dr.iastate.edu/swinereports_1998/21/asl_1570.pdf|||Fri Jan 14 22:31:20 UTC 2022 | |
dc.subject.disciplines | Agriculture | |
dc.subject.disciplines | Animal Sciences | |
dc.subject.keywords | ASL R1570 | |
dc.title | The Effect of Uterine Environment on Meishan and Yorkshire Fetal Development and Placental Size and Vascularity | |
dc.type | article | |
dc.type.genre | breeding_physiology | |
dspace.entity.type | Publication | |
relation.isSeriesOfPublication | 7f3839b7-b833-4418-a6fa-adda2b23950a |
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