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Blood samples were assayed to determine the plasma concentrations of prolactin, luteinising hormone, follicle stimulating hormone, human chorionic gonadotrophin, placental lactogen, oestrogen, progesterone and cortisol. The data show that: frequent and prolonged breast-feeding was associated with a marked increase in plasma prolactin concentrations to levels similar to those in lactating Gaing but higher than those in lactating Scottish women; ovulatory menstrual cycles and pregnancy occurred during frequent lactation; in lactating menstruating women there was an inverse correlation between fat weight and months post-partum. These data suggest that other factors as well as suckling account for the effects of lactation on fecundity.<\/jats:p>","DOI":"10.1017\/s0021932000006787","type":"journal-article","created":{"date-parts":[[2008,7,31]],"date-time":"2008-07-31T12:01:20Z","timestamp":1217505680000},"page":"35-52","source":"Crossref","is-referenced-by-count":17,"title":["Lactation, Nutrition and Fertility and the Secretion of Prolactin and Gonadotrophins in Mopan Mayan Women"],"prefix":"10.1017","volume":"24","author":[{"given":"A. 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