[Histologic and histometric studies of the epiphysis cerebri of the fattening guinea fowl (Meleagris gallopavo) after the use of different light regimens].

Chicken turkey-hens aged 8 weeks were exposed to a light regime of 1 hour light to 2 hours darkness for 8 weeks. Another experimental group was exposed to permanent lighting from hatching to the 16th week of age. The epiphyses of 5 males and females of either group were histologically, histochemically, and histometrically investigated. Significant differences were found to exist between the 2 experimental groups with regard to the nuclear volumes of epiphyseal cells. Epiphyseal cell activity was found to be reduced by permanent lighting.