Birth period, the abundance of food,the types of group are responsible for the difference in group size for spring and early summer.

• 混合群的社群组织最为松散，处于不稳定状态，雄性群最为稳定，羊群波动最小。 产仔期、食物丰富度及羊群类型是影响黄羊春季和夏初集群变化的重要因素。