At 9-week-old, experiment group 1 fed with Polyactin, experiment group 2 was treated with ND vaccine.Transform rate of T lymphoid cell was examined to check the immunity effect.

• 在9周龄时，实验组1饲喂增益素，实验组2接种鸡新城疫(ND)油乳剂疫苗，通过测定淋巴细胞转化率来监测细胞免疫效果。