奶牛隐性乳房炎诊断液YMT的研究

随机采集杨凌地区 1 72头泌乳奶牛的 2 74个乳样 ,分别用LMT诊断液、五种不同品牌洗衣粉配制的简易诊断液、自制诊断液YMT (Ⅰ和Ⅱ )进行实验室诊断 ,并对 1 94份乳样进行体细胞数检测 ,以验证上述各种诊断液诊断的准确性。结果 :LMT、“白猫”、“奇强”洗衣粉诊断液与体细胞计数法 (SCC法 )的符合率分别为 79 31 %、 69 85%和 63 2 4 % (P <0 0 5) ,自制诊断液YMTⅠ和Ⅱ型与LMT的阳性符合率分别为 :97 37%、 97 37% (P<0 0 5)。结果表明 :自制诊断液YMT (Ⅰ和Ⅱ )可以在实际生产中代替LMT用于隐性乳房炎的诊断     

Chlamydiaceae in cattle: commensals, trigger organisms, or pathogens?

Epidemiological data indicate that infection of cattle with chlamydiae such as Chlamydophila (C.) pecorum, C. abortus, C. psittaci and Chlamydia suis, is ubiquitous with mixed infections occurring frequently. The apparent lack of association between infection and clinical disease has resulted in debate as to the pathogenic significance of these organisms, and their tendency to sub-clinical and/or persistent infection presents a challenge to the study of their potential effects. However, recent evidence indicates that chlamydial infections have a substantial and quantifiable impact on livestock productivity with chronic, recurrent infections associated with pulmonary disease in calves and with infertility and sub-clinical mastitis in dairy cows. Data also suggest these infections manifest clinically when they coincide with a number of epidemiological risk factors. Future research should: (1) use relevant animal models to clarify the pathogenesis of bovine chlamydioses; (2) quantify the impact of chlamydial infection at a herd level and identify strategies for its control, including sub-unit vaccine development; and (3) evaluate the zoonotic risk of bovine chlamydial infections which will require the development of species-specific serodiagnostics.     

亚临床猪瘟的诊断报告

本文根据某机械化养猪场发生的非典型猪瘟的实例 ,分析了亚临床猪瘟的发病情况 ,综合了亚临床猪瘟在流行病学、临床症状 ,病理剖检等方面的资料 ,并结合实验室检验作出确诊。为今后类似该病的确诊和防制提供了一定参考。