After being treated and dried in the wind, the eggs are placed in a nursery where the temperature and humidity are carefully controlled.
蠶種是雌雄蛾交配產下的受精卵，通常都先貯存在冷藏庫中，從冷藏庫取出後，必須先經過浸酸風乾的手續，刺激胚子發育，然後放入能調節溫度及濕度的「催青箱」中孵化。