| 摘要: |
| 选经常规免疫ND、IBD的30周龄健康罗曼蛋鸡96只，按随机法等分为两组，分别置于2个人工气候室内，对照组环境温度保持22 ℃不变，试验组环境温度为22 ℃ 7 d,30 ℃ 7 d,35 ℃ 7 d,40 ℃ 4 h（部分1-43 h），21.3 ℃ 22 h。在不同温度段定期采血并作40 ℃ 15只鸡致死时间（heat stress survival time,HSST)测定。结果表明，①35 ℃ 166 h,40 ℃4 h能显著降低蛋鸡血液T淋巴细胞百分率，T、B细胞转化率和ND、IBD抗体水平。解除热应激21.3℃22 h免疫指标均未恢复正常，ND、IBD抗体水平消减速度趋缓。②30 ℃ 166 h,35 ℃ 166 h,40 ℃ 4 h均使蛋鸡血浆皮质酮显著上升，21.3 ℃ 22 h尚未恢复正常。③高温期蛋鸡免疫力指标下降率与其血浆皮质酮的升高百分离呈显著或极显著正相关，与其耐热力（HSST）呈显著负相关。 |
| 关键词: 热应激 蛋鸡 免疫力 血浆皮质酮 耐热力 |
| DOI： |
| 分类号: |
| 基金项目:陕西省科委资助项目部分内容(96K01-G1-02) |
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| The study of layers on the immune feature and relation with HSSTⅠChange of immune index and relation of that with plasma corti costerone,HSST |
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| Abstract: |
| 96 30 day healthy Roman layers which are routinely immuned to ND and IBD are selected and divided into 2 groups,and respectively put into 2 artificial climate rooms.The temperature of contrast group keeps at 22 ℃，and the that of test group is at 22 ℃ 7 d,30 ℃ 7 d,35 ℃ 7 d,40 ℃ 4 h(part of them are 1-43 h),21.3 ℃ 22 h,15 layer’s HSST (heat stress survival time) is measured at 40 ℃ in different period by taking a blood sample periodically.The result showed that:①the percent of T lymphocyte,the rate of transforming between T lymphocyte and B lymphocyte and antibody levels of ND and IBD are decreased obviously at 35 ℃ 166 h and 40 ℃ 4 h.Immune index is not recovered to the normal after removing heat stress 21.3 ℃ 22 h,and the speed of antibody rate of ND and IBD is decreased moderately.②Plasma corticosterone of layers is raised obviously at 30 ℃ 166 h,35 ℃ 166 h,40 ℃ 4h,and is not recovered to the immal at 21.3 ℃ 22 ℃.③There is significantly positive relationship between the decreasing rate of the immune indexes and the increasing rate of the plasma corticosterone at high temperature,but it is significantly negative relationship between the immue indexes and HSST. |
| Key words: heat stress layers immunity plasma corticosterone HSST |
