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贵州地区肉牛BRDC的4种病原调查与分析

Investigation and analysis of 4 pathogens of BRDC in beef cattle in Guizhou region

  • 摘要: 为了解贵州地区肉牛牛呼吸道疾病综合征(BRDC)感染情况,试验采用PCR方法对2018—2019年送检的169份BRDC患牛的肺脏样品进行牛支原体、化脓隐秘杆菌、多杀性巴氏杆菌和溶血性曼氏杆菌检测,并分析其阳性率在不同年份、季节之间的差异以及病原感染情况。结果表明:2018—2019年贵州地区送检的病料中,均检出牛支原体、化脓隐秘杆菌、多杀性巴氏杆菌和溶血性曼氏杆菌,平均阳性率分别为24.9%(42/169)、20.1%(34/169)、15.4%(26/169)和7.7%(13/169)。2019年与2018年相比,除牛支原体阳性率略有下降外,其余3种病原的阳性率均呈上升趋势。该病一年四季均有发生,以夏季和秋季多发。患牛以单一感染为主,阳性率为26.6%(45/169);混合感染的情况也存在,甚至还出现四重感染,以牛支原体和化脓隐秘杆菌的混合感染较为普遍。说明这4种病原引起的贵州肉牛BRDC中,牛支原体和化脓隐秘杆菌感染占主导地位。

     

    Abstract: In order to understand the infection of bovine respiratory disease complex(BRDC) in beef cattle in Guizhou, the experiment used PCR method to analyze the lung samples of 169 cases with BRDC submitted for inspection in 2018—2019 for the detection of Mycoplasma bovis,Trueperella pyogenes,Pasteurella multocida,and Mannheimia haemolytica,and the difference of the positive rates between different years, seasons was analyzed, as well as pathogen infection. The results showed that Mycoplasma bovis,Trueperella pyogenes,Pasteurella multocida,and Mannheimia haemolytica were all detected in the disease materials submitted for inspection in Guizhou from 2018 to 2019,and the average positive rates were 24.9%(42/169),20.1%(34/169),15.4%(26/169) and 7.7%(13/169),respectively. Compared to 2018, except for a slight decrease in the positive rate of Mycoplasma bovis,the positive rates of the other three pathogens were all on the rise in 2019.The disease occurred throughout the year, and more frequently in summer and autumn.The majority of infected cattle were single infection, with a positive rate of 26.6%(45/169);mixed infections also existed, and even quadruple infections, and mixed infections of Mycoplasma bovis and Trueperella pyogenes were common. The results suggested that BRDC of beef cattle in Guizhou cansed by these 4 pathogens, which Mycoplasma bovis and Trueperella pyogenes infection were dominant.

     

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