Tibetan chick acclimatize themselves up to high altitude (4,200 m) and the other breeds in low grounds survive rarely with a low hatchability (3.0%) after incubation under hypoxia of simulated 4,200m.

• 藏鸡能在4200米以上海拔正常繁衍生息；但低地鸡在模拟4200米海拔(12.；0%25O_2)条件下孵化却只有3