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This paper reports that female rats on such a diet had normal oestrous cycles and became pregnant when mated, but always resorbed the foetuses and no litters were born. The first abnormalities detected were necrosis and slight polymorph infiltration around the periphery of the placental disk about the sixteenth day of pregnancy. Supplementation with retinol as late as the tenth day resulted in the birth of a healthy litter. Retinoic acid therefore maintained the early but not the later stages of gestation. When very small amounts of retinol were given during pregnancy, dead or weak young were born; on higher supplements of the vitamin, litters were weaned successfully. By this means young rats were produced with negligible stores of retinol. Male rats fed retinoic acid but not retinol had small and often oedematous testes. The germinal epithelium sloughed off and in some tubules the lumen was obliterated, but in others the lumen remained, and in these some spermatocytes and spermatogonia were held tenaciously. The seminal vesicles were smaller than in controls given retinol. In rats born with negligible stores of retinol\u2014see above\u2014and maintained on retinoic acid, the testes remained infantile; spermatids were never formed. Feeding retinol restored spermatogenesis in degenerate testes and promoted the normal development of testes that had remained infantile; it also ensured the growth of the seminal vesicles. Retinoic acid did not therefore serve in reproduction, although it replaced the true vitamin in maintaining life, growth and general health. Besides the latter so-called systemic function, vitamin A must have a discrete and specific role in reproduction, viz. that performed by retinol but not by retinoic acid. From among the many previously reported features of disordered reproduction in vitamin A-deficient animals, it was possible to distinguish which had arisen from a failure of this specifically \u2018reproductive\u2019 role and which from a \u2018systemic\u2019 deficiency. The inactivity of retinoic acid in reproduction demonstrates that in rats vitamin A has not two, as previously thought, but three dissociable modes of action: (1) systemic; (2) in vision; and (3) in reproduction.<\/jats:p>","DOI":"10.1098\/rspb.1964.0017","type":"journal-article","created":{"date-parts":[[2006,12,18]],"date-time":"2006-12-18T18:11:46Z","timestamp":1166465506000},"page":"510-535","source":"Crossref","is-referenced-by-count":220,"title":["Vitamin A and reproduction in rats"],"prefix":"10.1098","volume":"159","author":[{"given":"J. N.","family":"Thompson","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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