Genchi C, Madonna M, Traldi G
Istituto di Patologia Generale Veterinaria, Facoltà di Medicina Veterinaria, Università degli Studi, Milano.
Parassitologia. 1989 Aug-Dec;31(2-3):123-32.
The epidemiology of Trichostrongylidae infections in three dairy cow groups reared under different conditions and in different habitats was studied with particular emphasis on Ostertagia ostertagi. In cows bred intensively in swampy lowlands (Po River Valley) the prevalence of infection was 43% and the mean intensity 567. In cows bred traditionally (Friuli, Northern-Eastern Italy), the prevalence in permanently housed cows was 24% (mean intensity: 13). In grazing cows, it was 68% (mean intensity: 120). The distribution of parasite numbers (O. ostertagi) per host was studied with the negative binomial model. The observed data were also compared by the method of cumulative relative frequencies. The results suggest that parasitism is also important in cows reared intensively.
研究了在不同条件和不同栖息地饲养的三组奶牛中毛圆科感染的流行病学，特别着重于奥斯特他线虫。在沼泽低地（波河流域）集约化饲养的奶牛中，感染率为43%，平均感染强度为567。在传统饲养的奶牛（意大利东北部弗留利地区）中，长期圈养奶牛的感染率为24%（平均感染强度：13）。在放牧奶牛中，感染率为68%（平均感染强度：120）。采用负二项式模型研究了每个宿主的寄生虫数量（奥斯特他线虫）分布。还通过累积相对频率法对观察数据进行了比较。结果表明，寄生虫感染在集约化饲养的奶牛中也很重要。
