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T. A. Bongso, P. K. Basrur and E. V. YoungLai


The testosterone concentration in allantoic fluid between 90 and 150 days of gestation in cattle can be used to determine the fetal sex; values were 442±20·3 (S.E.M.) pg testosterone/ml for male fetuses and 215±8·2 pg/ml for female fetuses.