Effects of hCG and of season on in vitro steroidogenesis by 18-day chick embryo gonads Arlette GUICHARD, Katy HAFFEN, Lise CEDARD, Thérèse-Marie MIGNOT and Denise SCHEIBAnn. Biol. anim. Bioch. Biophys., 19 4B (1979) 1317-1325DOI: https://doi.org/10.1051/rnd:19790816