Experiments were conducted with 270 Abore Acre male broilers to study the influence of dietary chlortetracycline(CTC) on the bursal, thymus and spleen weight index and T,B cell proliferation and antibody responses of broilers.

• 270只 Abore Acre商品代肉用公鸡随机分成 3组，金霉素在饲料中添加水平分别为 0.；50和 150mg/kg，研究饲用金霉素对肉仔鸡法氏囊、脾脏和胸腺等免疫器官发育、以及免疫反应的影响。