不同储存期玉米对肉鸡免疫功能的影响.docVIP

 不同储存期玉米对肉鸡免疫功能的影响# * 5 10 15  摘要：本研究旨在探讨不同储存期玉米对肉鸡免疫器官重量及免疫功能的影响。选取 1 日龄 雌性科宝商品代雏鸡 240 只，随机分成 3 组（每组 8 个重复，每个重复 10 只），分别饲喂 由储存 2、4 年玉米配制的试验饲粮，与储存 0 年玉米作对照，试验期 42d，测定 17 日龄淋 巴细胞转化率，21 和 42 日龄时免疫器官指数、血清 IgG、血清新城疫抗体（ND-Ab）效价、 血清溶菌酶指标。结果表明：1）21 日龄时，与对照组相比，储存 2 年玉米对肉鸡免疫器官、 血液特异性免疫和非特异性免疫没有显著影响(P0.05)，但储存 4 年玉米显著降低了肉鸡胸 腺、法氏囊、脾脏指数（P0.05），显著降低血清淋巴细胞 ConA 刺激指数（P0.05），以 及 IgG 水平、ND-Ab 效价和溶菌酶活性（p0.05）。2）42 日龄时，与对照组相比，储存 2 年玉米对肉鸡免疫器官、血液特异性免疫和非特异性免疫没有显著影响(P0.05)，但储存 4 年玉米显著降低了肉鸡脾脏指数（P0.05）以及血清 IgG 水平(P0.05)，对其他免疫指标没 有影响(P0.05)。结果显示，玉米储存期过长导致肉鸡的免疫功能下降。 关键词：玉米；储存期；肉鸡；免疫功能 中图分类号：S831.5 20 Effects of Maize with Different Storage Time on Immune Function of Broilers CUI Xiaoyan1,3, YUAN Jianmin2, ZHANG Bingkun2, YAN Daren3 (1. College of Animal Science and Technology,China Agricultural University; 25 30 35 40 2. College of Animal Science and Technology, China Agricultural University; 3. College of Wildlife Resources, Northeast Forest University) Abstract: The study was conducted to explore the effects of maize with different storage time on immune organ weight and immune function of broilers. Two hundred and forty one-day-old Cobb 500 female broilers were chosen and randomly allocated to 3 groups with 8 replicates per group and 10 chickens per replicate. Broilers in control group were fed maize stored 0 year and broilers in experiment groups were fed maize stored 2 or 4 years. The experiment lasted for 42 days. Lymphocyte proliferation of peripheral blood, immune organ index , serum IgG, antibody titers to Newcastle disease virus (ND-Ab), and serum lysozyme activity of broiler chickens were tested. The results showed that: 1) compared with the control, maize stored two years had no significant effect on immune organ weight, blood specific immunity and nonspecific immunity of broilers (P0.05) at 21 day. However, four years stored maize significantly decreased thymus index, spleen index, bursa of fabricius index (p0.05), peripheral lymphocyte ConA stimulus index (p0.05), and s