畜牧兽医学报 ›› 2020, Vol. 51 ›› Issue (4): 772-782.doi: 10.11843/j.issn.0366-6964.2020.04.013

• 营养与饲料 • 上一篇    下一篇

饲粮精氨酸水平对肉仔鸡免疫功能及其抗FAdV-4影响的研究

林智鑫1, 周嘉鑫1, 陈立圳1, 高玉云1, 王全溪1,2, 王长康1*   

  1. 1. 福建农林大学动物科学学院(蜂学学院), 福州 350002;
    2. 福建农林大学, 福建省中兽药卫生重点实验室, 福州 350002
  • 收稿日期:2019-11-13 出版日期:2020-04-25 发布日期:2020-04-21
  • 通讯作者: 王长康,主要从事动物营养与饲料科学研究,E-mail:wangchangkangcn@163.com
  • 作者简介:林智鑫(1995-),男,福建福州人,硕士生,主要从事动物营养与饲料科学研究,E-mail:514437853@qq.com
  • 基金资助:
    福建省家禽产业体系(2019-2022)

Effects of Dietary Arginine Levels on Immune Function and Anti-FAdV-4 Capacity of Broilers

LIN Zhixin1, ZHOU Jiaxin1, CHEN Lizhen1, GAO Yuyun1, WANG Quanxi1,2, WANG Changkang1*   

  1. 1. College of Animal Science(College of Bee Science), Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    2. Fujian Key Laboratory of Traditional Chinese Veterinary Medicine and Animal Health, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2019-11-13 Online:2020-04-25 Published:2020-04-21

摘要: 本试验旨在研究饲粮精氨酸水平对肉仔鸡免疫功能及其抗禽腺病毒I群4型(fowl adenovirus serotype 4,FAdV-4)的影响。选取1日龄罗斯(Ross)308肉仔鸡300只,随机分为5组(每组5个重复,每个重复12只),设置5个饲粮精氨酸水平组,分别为0.96%、1.20%、1.44%、1.68%和1.92%,试验鸡饲养至21日龄,各重复随机选取4只测定血清免疫指标和免疫相对器官指数。随后各重复再次随机选取6只,并分为感染组和对照组,感染组肌肉注射FAdV-4 NP毒株0.2 mL(TCID50=10-6.23/0.01 mL),对照组肌肉注射等量灭菌生理盐水,感染2 d后,统计死亡率、发病率,ELISA测定肝组织iNOS水平、qPCR测定肝iNOS mRNA表达量及病毒载量。结果表明:1)饲粮精氨酸水平为1.44%、1.68%和1.92%时,均能显著提高脾脏指数(P<0.05)且精氨酸水平为1.68%能显著提高胸腺指数(P<0.05),而精氨酸水平为0.96%会显著降低脾脏、胸腺和法氏囊指数(P<0.05)。2)1.68%精氨酸水平组能显著提高血清球蛋白(GLO)、IgG水平和球蛋白/白蛋白(G/A)比值(P<0.05);精氨酸水平为0.96%显著降低血清球蛋白和IgG水平(P<0.05)。3)精氨酸水平为0.96%可显著降低肉仔鸡血清中IL-1β、TNF-α、iNOS和NO水平(P<0.05),而1.68%和1.92%精氨酸水平组均能显著提高肉仔鸡血清中IL-1β、TNF-α、IFN-γ和iNOS水平(P<0.05)。4)肉鸡感染FAdV-4后,0.96%精氨酸水平组的死亡率会显著高于1.20%、1.44%、1.68%和1.92%组(P<0.05)。5)ELISA测定结果显示,1.44%、1.68%和1.92%精氨酸水平组能显著提高感染后的肝组织iNOS水平。6)1.44%、1.68%和1.92%精氨酸水平组均能显著提高肝iNOS mRNA表达水平(P<0.05);肉鸡感染FAdV-4,iNOS mRNA水平均会显著降低(P<0.05),1.44%、1.68%和1.92%精氨酸水平组能提高感染FAdV-4后肝iNOS mRNA水平(P<0.05)并显著降低肝的病毒载量(P<0.05)。由此可见,肉仔鸡饲粮中精氨酸的不足会降低其机体的免疫功能及抗FAdV-4病毒能力。提高肉仔鸡饲粮中精氨酸水平不仅能提高免疫器官指数、血清免疫因子水平及肝iNOS mRNA表达水平,降低肝的病毒载量,从而提高机体免疫功能和抗病毒能力。

关键词: 精氨酸, 免疫功能, iNOS, FAdV-4

Abstract: The aim of this study was to investigate the effects of dietary arginine levels on immune function in broilers and explore the mechanism of arginine anti-fowl adenovirus serotype 4 (FAdV-4). Three hundred one-day-old broilers(Ross 308) were randomly allocated to 5 groups with 5 replicates per group and 12 chickens per replicate. The experimental diets were set to 5 arginine levels of 0.96%, 1.20%, 1.44%, 1.68%, and 1.92%, respectively. The feeding trial lasted for 21 days. Four broilers were randomly selected from each replicate to determine serum immune index and immune relative organ index. Then, six broilers were randomly selected from each replicate and randomly divided into infected group and control group. The chickens in the infected group were individually infected with 0.2 mL of FAdV-4 NP strain (TCID50=10-6.23/0.01 mL) by intramuscular injection; the chickens of control group were individually injected with the same volume of sterile saline. Two days after infection, mortality rate and disease incidence were calculated. iNOS levels in livers were determined by ELISA. iNOS mRNA expression and viral load in livers were detected by qPCR. The results showed that:1) Three arginine levels of 1.44%, 1.68%, and 1.92% significantly increased spleen index (P<0.05) and arginine level of 1.68% significantly increased thymus index (P<0.05), while arginine level of 0.96% significantly reduced spleen index, thymus index and bursal index (P<0.05). 2) The arginine level of 1.68% significantly increased serum GLO, IgG levels and G/A value (P<0.05). Arginine level of 0.96% significantly decreased serum GLO and IgG levels (P<0.05). 3) The arginine level of 0.96% significantly decreased serum IL-1β, TNF-α, iNOS and NO levels (P<0.05), while the arginine levels of 1.68% and 1.92% significantly increased IL-1β, TNF-α, IFN-γ and iNOS (P<0.05). 4) After broilers infected with FAdV-4, the mortality rate in the 0.96% group was significantly higher than those of 1.20%, 1.44%, 1.68%, and 1.92% groups (P<0.05). 5) ELISA results showed that 1.44%, 1.68%, and 1.92% arginine levels could significantly increase iNOS levels in liver after infection. 6) The arginine levels of 1.44%, 1.68%, and 1.92% significantly increased the expression of iNOS mRNA in livers (P<0.05). After broiler were infected with FAdV-4, the level of iNOS mRNA in the livers were significantly decreased (P<0.05). High levels of arginine (1.44%, 1.68%, and 1.92%) increased the level of iNOS mRNA expression in the livers after broilers infected with FAdV-4 (P<0.05) and significantly reduced the viral load of the livers (P<0.05). It could be seen that deficiency of arginine in the diet could reduce the immune function and anti-FAdV-4 virus ability of the chicken. Increasing arginine levels in broiler diets not only improved immune organ index, serum immune factor levels, and iNOS mRNA expression levels in the livers, but also reduced viral load of livers, thereby improving immune function and antiviral capacity.

Key words: arginine, immune function, iNOS, FAdV-4

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