本研究的主要目的：1）比较产仔限位栏与分娩圈栏系统对母猪行为活动的影响；

Objects of this study are: 1)to compare the effect on behaviour activities of sows in crate and in pen;

youdao

我们现在只兴建具有坚实屋顶的栏圈，因为我们发现这种类型的栏圈无论对鸟还是我们自己都更具吸引力。

We now only build pens with solid roofs as we find this type of pen more appealing to both the inhabitants and ourselves.

youdao

我们现在只兴建具有坚实屋顶的栏圈，因为我们发现这种类型的栏圈无论对鸟还是我们自己都更具吸引力。

We now only build pens with solid roofs as we find this type of pen more appealing to both the inhabitants and ourselves.

youdao