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.

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第五步：现在转到在工具栏，选取历史记录画笔工具(红圈的那个)。

Step 5: Trot over to the toolbar and grab the History Brush (circled in red below).

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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;

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