Influence of temperature and gonadal steroids on the testis composition inRana esculenta

Summary Male frogs at 28°C show an increase in the testis weight and a decrease in its protein content. At 15°C and 4°C the testis lipids increase. Testosterone administration nullifies the low temperature-induced changes in the testis.We are thankful to Prof. G. Chieffi for his criticism. Work done under the C.N.R.-financed finalized project Biologia della Riproduzione.