在分娩当天、第28天分别记录母猪背膘厚和体重；
On parturition day and the 28~(th) day, backfat thickness, body weight of lactation sows were recorded respectively.
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;
冬季分娩的母猪具有最高的NSB ，秋季最低；
The sows farrowed in winter had the highest NSB and the lowest PBA;
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