{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T23:45:28Z","timestamp":1767915928123,"version":"3.49.0"},"reference-count":0,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[1980,11,1]],"date-time":"1980-11-01T00:00:00Z","timestamp":341884800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":["reproduction-online.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[1980,11,1]]},"abstract":"<jats:p>Summary. In rats that were allowed to eat the placentae after parturition concentrations of serum prolactin were elevated on Day 1 but concentrations of serum progesterone were depressed on Days 6 and 8 post partum when compared to those of rats prevented from eating the placentae. In rats treated with PMSG to induce superovulation serum prolactin and progesterone values were significantly (P &amp;lt; 0\u00b705) elevated on Days 3 and 5 respectively, after being fed 2 g rat placenta\/ day for 2 days. However, feeding each rat 4 g placenta\/day significantly (P &amp;lt; 0\u00b702) lowered serum progesterone on Day 5. Oestrogen injections or bovine or human placenta in the diet had no effect. The organic phase of a petroleum ether extract of rat placenta (2 g-equivalents\/day) lowered peripheral concentrations of progesterone on Day 5, but other extracts were ineffective. We conclude that the rat placenta contains orally-active substance(s) which modify blood levels of pituitary and ovarian hormones.<\/jats:p>","DOI":"10.1530\/jrf.0.0600273","type":"journal-article","created":{"date-parts":[[2004,3,20]],"date-time":"2004-03-20T01:55:52Z","timestamp":1079747752000},"page":"273-278","update-policy":"https:\/\/doi.org\/10.1530\/rep\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":24,"title":["Effects of placentophagy on serum prolactin and progesterone concentrations in rats after parturition or superovulation"],"prefix":"10.1093","volume":"60","author":[{"given":"M. S.","family":"Blank","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H. G.","family":"Friesen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[1980,11,1]]},"container-title":["Reproduction"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/academic.oup.com\/reproduction\/article-pdf\/60\/2\/273\/64934012\/jrf_60_2_002.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/academic.oup.com\/reproduction\/article-pdf\/60\/2\/273\/64934012\/jrf_60_2_002.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T18:17:46Z","timestamp":1767896266000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/reproduction\/article\/60\/2\/273\/8290285"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1980,11,1]]},"references-count":0,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1980,11,1]]}},"URL":"https:\/\/doi.org\/10.1530\/jrf.0.0600273","relation":{},"ISSN":["1470-1626","1741-7899"],"issn-type":[{"value":"1470-1626","type":"print"},{"value":"1741-7899","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[1980,11,1]]},"published":{"date-parts":[[1980,11,1]]}}}