The objective of this study was to evaluate effects of partial substitution of concentrate with ryegrass on reproductive performance in Changjia sows.
用青绿饲料黑麦草部分替代精料饲喂长嘉母猪，研究替代后对母猪繁殖性能的影响。
The study showed that parity, birth month, backfat thickness had significant effect on reproductive performance of sows.
表明胎次、产仔月份、背膘厚度对母猪繁殖性能有较大影响。
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