L'Hostis M, Bureaud A, Gorenflot A
Laboratoire de parasitologie, Ecole nationale vétérinaire, Nantes, France.
Vet Res. 1996;27(6):589-97.
Data collected from a longitudinal survey carried out over a 2 year period in four herds located in western France were used to assess the infestation level in cattle by female ixodes ricinus and to describe its seasonality. Farms were visited once a month. The population studied consisted of calves, heifers and dairy cows (of Holstein and Norman de breeds). The total number of animals monitored varied from 207 to 173 throughout the study, because of the culling of dairy cows and birth of calves. The infestation level by l ricinus varied from one herd to another. Heifers were found to have a greater level of infestation than dairy cows and calves. The infestation rate appeared to be low, ie, most animals (between 47 and 83%) were infested by only one tick in the axilla. The seasonal distribution of ticks showed two peaks, one in spring and a second lower one in autumn, with slight fluctuations between herds and years. The number of ticks on cattle and the percentage of infested animals showed a parallel seasonality.
从法国西部四个牛群中进行的为期两年的纵向调查收集的数据，用于评估牛被蓖麻硬蜱雌蜱感染的水平，并描述其季节性。每月对农场进行一次走访。所研究的牛群包括犊牛、小母牛和奶牛（荷斯坦和诺曼品种）。由于奶牛的淘汰和犊牛的出生，在整个研究过程中，监测的动物总数从207头到173头不等。蓖麻硬蜱的感染水平因牛群而异。发现小母牛的感染水平高于奶牛和犊牛。感染率似乎较低，即大多数动物（47%至83%）仅在腋窝处被一只蜱虫感染。蜱虫的季节性分布有两个高峰，一个在春季，另一个在秋季且较低，不同牛群和年份之间有轻微波动。牛身上的蜱虫数量和受感染动物的百分比呈现出平行的季节性。
