苜蓿提取物对肉仔鸡内分泌和免疫指标的影响

Effect of alfalfa extracts on endocrine and immune indexes of broilers

添加600mg/kg苜蓿提取物能够提高28、35日龄肉仔鸡法氏囊指数,显著提高血清中三碘甲状腺原氨酸和皮质醇水平,促进35、42日龄肉仔鸡B细胞分裂增殖,显著提高42日龄肉仔鸡血清皮质醇水平和极显著提高法氏囊指数;添加400mg/kg苜蓿提取物能够显著提高28、35日龄肉仔鸡法氏囊指数、血清中三碘甲状腺原氨酸和皮质醇水平,显著提高35日龄肉仔鸡脾脏器官指数、血清球蛋白和促进B细胞分裂增殖,极显著提高42日龄肉仔鸡皮质醇水平和法氏囊指数,但效果不及600mg/kg苜蓿提取物组;添加200mg/kg苜蓿提取物对这些指标没有显著影响。日粮中添加600mg/kg苜蓿提取物效果较佳。

Adding 600 mg/kg of alfalfa extract in diets could increase bursal index of 28,35-day broiler, significantly increase triiodothyronine in serum and cortisol levels, promote B cell proliferation of 35, 42-day broiler, significantly increase serum eortisol levels and bursa index of 42-day broiler; adding 400 mg/kg alfalfa extract could significantly increase bursal index,triio- dothyronine in serum and cortisol levels of 28, 35-day broiler, and spleen organ index, serum globulin of 35-day broilers and promote B cell proliferation, significantly increase cortisol levels and bursa index of 42-day broiler, but the effect was less than that of 600 mg/kg alfalfa extract group; adding 200 mg/kg alfalfa extract had no significant effect on these indexes. The diets added 600 mg/kg alfalfa extract was better.