Van den Bossche P, Rowlands G J
Institute of Tropical Medicine (ITM), Veterinary Department, Nationalestraat 155, Antwerpen, Belgium.
Acta Trop. 2001 Feb 23;78(2):163-70. doi: 10.1016/s0001-706x(00)00182-0.
The relationship between prevalence of trypanosomal infections (Trypanosoma congolense) and average packed cell volume (PCV) in herds of communally managed adult Angoni breed cattle was investigated in four districts of eastern Zambia. In all areas, regression analyses showed that the herd average PCV decreased with increasing prevalence of trypanosomal infections. The slope of the equation between average PCV and trypanosome prevalence decreased with increasing prevalence of trypanosomal infections. For the same increase in prevalence of trypanosomal infection, the decrease in herd PCV was higher in the areas with low to medium prevalence. Season of sampling also determined the slope of the regression equation. For the same increase in prevalence of trypanosomal infection, the decrease in herd PCV was higher during the dry compared to the rainy season suggesting that trypanosomosis is less well tolerated during the dry season. Results from the study suggest that the relationship between the prevalence of trypanosomal infections and herd average PCV could be a useful tool in the management of trypanosomosis and planning of its control. Reasons for the spatial and temporal variations in the relationship are discussed.
在赞比亚东部的四个地区，对社区管理的成年安戈尼品种牛群中锥虫感染（刚果锥虫）患病率与平均红细胞压积（PCV）之间的关系进行了调查。在所有地区，回归分析表明，牛群平均PCV随着锥虫感染患病率的增加而降低。平均PCV与锥虫患病率之间方程的斜率随着锥虫感染患病率的增加而降低。对于相同的锥虫感染患病率增加，在低至中等患病率地区，牛群PCV的下降幅度更大。采样季节也决定了回归方程的斜率。对于相同的锥虫感染患病率增加，与雨季相比，旱季牛群PCV的下降幅度更大，这表明在旱季锥虫病的耐受性较差。研究结果表明，锥虫感染患病率与牛群平均PCV之间的关系可能是锥虫病管理及其控制规划中的一个有用工具。文中讨论了这种关系在空间和时间上变化的原因。
