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The proportion of <jats:styled-content style=\"fixed-case\">PA<\/jats:styled-content> blastocysts (20.5%) was higher than that of their <jats:italic>in\u00a0vitro<\/jats:italic> fertilization (<jats:styled-content style=\"fixed-case\">IVF)<\/jats:styled-content> counterparts (16.6%). Although there were no differences in morphology or diameter between the two groups, the number of cells in early <jats:styled-content style=\"fixed-case\">PA<\/jats:styled-content> blastocysts after <jats:italic>in\u00a0vitro<\/jats:italic> culture for 6\u00a0days was lower than for <jats:styled-content style=\"fixed-case\">IVF<\/jats:styled-content> blastocysts (25.7 and 30.4 cells, respectively), and the number in recovered <jats:styled-content style=\"fixed-case\">PA<\/jats:styled-content> blastocysts was also smaller than that in recovered <jats:styled-content style=\"fixed-case\">IVF<\/jats:styled-content> blastocysts (37.4 and 50.2 cells, respectively). When 10 morulae warmed after vitrification were co\u2010transferred with 10 <jats:styled-content style=\"fixed-case\">PA<\/jats:styled-content> blastocysts (total 20 embryos) to the uterus of five recipients, the rates of pregnancy and farrowing did not differ, but the average period until spontaneous abortion tended to be longer relative to the control (when 20 morulae were transferred). These data suggest that <jats:italic>in\u00a0vitro<\/jats:italic>\u2010produced <jats:styled-content style=\"fixed-case\">PA<\/jats:styled-content> embryos offer the possibility of assisted pregnancy for cryopreserved embryos; further experiments will be needed to confirm the beneficial effect of this approach on piglet production.<\/jats:p>","DOI":"10.1111\/asj.12869","type":"journal-article","created":{"date-parts":[[2017,8,11]],"date-time":"2017-08-11T03:12:39Z","timestamp":1502421159000},"page":"1925-1933","source":"Crossref","is-referenced-by-count":4,"title":["Utilization of porcine <i>in\u00a0vitro<\/i>\u2010produced parthenogenetic embryos for co\u2010transfer with vitrified and warmed embryos"],"prefix":"10.1111","volume":"88","author":[{"given":"Yoshiyuki","family":"Nakamura","sequence":"first","affiliation":[{"name":"Saitama Prefectural Agricultural Technology Research Center Kumagaya Japan"},{"name":"Division of Animal Sciences Institute of Agrobiological Sciences National 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