| 摘要: |
| 选经常规免疫ND，IBD的28周龄尼克红蛋鸡200只，按随机去法等分为5组，放置于人工气候室内，5组日粮Se水平分别为0.1（对照组），0.15,0.20,0.25,0.30 mg/kg，供试温度为33 ℃，试期共28 d，供试鸡分别在33 ℃ 166 h,33 ℃ 334 h,33 ℃ 502 h,33 ℃ 670 h空腹采血并测定有关指标。结果表明，蛋鸡日粮Se水平为0.20-0.25 mg/kg的试验组，经过33 ℃ 502 h，其血液淋巴细胞百分率，T、B淋巴细胞转化率，ND，IBD抗体滴度均显著（P＜0.05）或极显著（P＜0.01）地高于日粮Se水平0.10 mg/kg组的同类指标。日粮Se水平为0.20-0.25 mg/kg时，蛋鸡血液免疫指标的改善程度不一。表明在较长高温环境下，日粮Se水平为0.20-0.25 mg/kg时能明显改善蛋鸡的免疫功能。 |
| 关键词: 热应激 日粮Se水平 蛋鸡 免疫力 |
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| 基金项目:陕西省科技厅资助项目(2000K03-02) |
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| The effect of dietary selenium levels on the immune function of layers in chamber temperature |
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| Abstract: |
| Two hundred 28-week old hens which via routine immune ND and IBD were divided into five groups randomly,then they were laid up in man made climate room.In five groups the dietary Se levels were 0.10 (control group),0.15,0.20,0.25 and 0.30 mg/kg respectively.The test was at 33℃ and within 28 days.Taking blood on an empty stomach and determining relevant index of testing layers were at 33 ℃ 166 h,33 ℃ 334 h,33 ℃ 502 h and 33 ℃ 670 h separately.The results showed that:the dietary Se level between 0.20 and 0.25 mg/kg at 33 ℃ 502 h,the percentage of blood lymphocyte,the changeable rate of T and B lymphocyte as well as ND and IBD antibody titer were all significantly higher than the similar index of 0.10 mg/kg (P<0.05) or (P<0.01).As the level of dietary Se was 0.30 mg/kg,the degree of improving immune index of blood was different.It showed that the level of dietary Se between 0.20 and 0.25 mg/kg could obviously improve the immune function of layers at high temperature for a long time. |
| Key words: heat stress dietary Se levels layers immunity |
