A Decreased Placental Size and Increased Vascular Density Results in Increased Prolificacy in the Meishan Pig

dc.contributor.author Wilson, M.
dc.contributor.author Ford, Stephen
dc.contributor.author Biensen, Nina
dc.date 2018-02-13T00:38:14.000
dc.date.accessioned 2020-07-02T06:59:44Z
dc.date.available 2020-07-02T06:59:44Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1997
dc.date.embargo 2012-08-20
dc.date.issued 1997
dc.description.abstract <p>The Chinese Meishan pig farrows 3 to 5 more pigs per litter than U.S. pig breeds. When Meishan and Yorkshire embryos are co-transferred to a Yorkshire recipient, Meishan fetuses and placentae are smaller than Yorkshire fetuses and placentae through day 90 of gestation. At farrowing, Meishan placentae are still smaller than Yorkshire placentae; however, Meishan fetuses are born at the same weight as their Yorkshire littermates. This tremendous growth of the Meishan fetus between day 90 and term is the result of an increased vascularization of the Meishan placenta. In this experiment we investigated the time course of placental vascular development of Meishan and Yorkshire conceptuses during late gestation. Our results demonstrate that Yorkshire fetuses increase the potential for nutrient extraction from the maternal blood by increasing the size of their placentae; however, Meishan fetuses achieve the same end by increasing the density of placental blood vessels while maintaining a constant placental size. The increased vascular density of the Meishan placenta then allows the conceptus to occupy less space in the uterus, allowing more fetuses to survive to term.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/swinereports_1996/18/
dc.identifier.articleid 1019
dc.identifier.contextkey 3236149
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath swinereports_1996/18
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/90994
dc.language.iso en
dc.relation.ispartofseries Animal Science Research Reports
dc.relation.ispartofseries ASL R1383
dc.source.bitstream archive/lib.dr.iastate.edu/swinereports_1996/18/asl_1383.pdf|||Fri Jan 14 21:32:11 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Animal Sciences
dc.subject.keywords ASL R1383
dc.title A Decreased Placental Size and Increased Vascular Density Results in Increased Prolificacy in the Meishan Pig
dc.type article
dc.type.genre breeding_physiology
dspace.entity.type Publication
relation.isSeriesOfPublication 7f3839b7-b833-4418-a6fa-adda2b23950a
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