Mean frequency of head shakes, head turns and combined point behaviours displayed by calves in each treatment group within a 5-minute focal sample at each time-point.

Mean frequency of head shakes, head turns and combined point behaviours displayed by calves in each treatment group within a 5-minute focal sample at each time-point.各处理组犊牛在每个时间点的5分钟焦点取样时段内，所表现出的摇头、转头及复合指向行为的平均发生频次。