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The switch from (fetal) to β (adult) globin production was studied by the analysis of globin synthesis in chronically cannulated ovine fetuses and newborn lambs. The / globin synthesis ratio decreased from 0·98 ± 0·11 (S.D.) (n = 4 samples) at 100–120 days of gestation to 0·15± 0·07 (n = 4) in lambs of 150–156 days post-conception, and the β/ synthesis ratio increased from 0·04 ± 0·06 (n = 4) to 1·13 ± 0·21 (n = 4) over the same period. In bilaterally adrenalectomized fetuses, which survived in utero until 151–156 days, the / and β/ synthesis ratios were 0·64 ± 0·14 (n = 3) and 0·25 ± 0·07 (n = 3) respectively in the 150- to 156-day period. Bilateral adrenalectomy did not affect the time of onset of β globin synthesis, but significantly decreased the rate. In one bilaterally adrenalectomized fetus the infusion of increasing concentrations of cortisol restored the rate of β globin synthesis to normal. Treatment of three intact fetuses with 100 µg cortisol/h for 3 weeks, from 100 to 121 days, did not affect the timing or rate of switch from to β globin synthesis. Thus fetal adrenal secretions, probably cortisol, affected the rate of change of to β globin synthesis but other factors must have been involved in the initiation of the switch.

J. Endocr. (1985) 104, 165–170