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在东北地区 ,将牛蛙的幼蛙及蝌蚪放养在塑料大棚内的池塘里与在自然条件下越冬进行对比试验。结果表明 :在东北地区 ,幼蛙生长期延长了 82d ,成活率提高了 17 5 % ,整个越冬期内净增重差异极显著 (P <0 0 1) ,净增重率为 2 74% ;蝌蚪的生长期延长了 95d ,成活率提高了 8 9% ,净增重差异也极显著 (P <0 0 1) ,净增重率为 2 30 % ;有 12 6 %的蝌蚪在越冬后期发生了变态。
In the northeast, the bullfrog frogs and tadpoles were stocked in ponds in plastic greenhouses for comparison with winter winters in natural conditions. The results showed that in the Northeast China, the growth period of juvenile frogs was prolonged by 82 days and the survival rate was increased by 17.5%. The net weight gain during the whole winter was significantly different (P <0.01) and the net weight gain was 2 74%. The growth period of tadpoles was extended 95d, the survival rate increased by 89%, the net weight gain was also significantly different (P <0.01), the net weight gain rate was 230%; 12 6% tadpoles occurred in late winter. Perverted.