A total of 720 Lohman brown parent-breeding layers were randomly divided into 4 dietary treatments. The basal diet were supplemented 0.05% terramycin, 0.1% and 0.2% compound probiotics, respectively.

  • 试验选用25周龄罗曼褐父母代蛋种鸡720只,随机分为4个组,试验组分别在空白对照组饲粮基础上添加0.05%土霉素、0.1%和0.2%的复合益生菌制剂,以比较其效果。

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