Banks D J, Singh R, Barger I A, Pratap B, le Jambre L F
CSIRO Division of Animal Health, Koronivia Veterinary Laboratory, Nausori, Fiji.
Int J Parasitol. 1990 Apr;20(2):155-60. doi: 10.1016/0020-7519(90)90095-5.
A trial to determine the seasonal pattern of egg hatching and larval survival on pasture was carried out in representative wet and dry zones of Fiji. Fourteen plots were established on parasite-free pasture at each of two sites. One plot at each site was contaminated every month with faeces from naturally infected goats containing a known proportion of Haemonchus contortus and Trichostrongylus colubriformis eggs. Pasture was sampled at regular intervals after contamination and infective larvae identified and counted. Larvae of both species developed throughout the year in the wet zone but development was more sporadic in the dry zone. Larval counts generally declined to below detectable levels within 9 weeks of contamination between September and March but longevity increased during the cooler weather from April to August. The comparatively short larval survival times noted in this experiment may present opportunities for manipulation of parasite population dynamics in the wet tropics.
在斐济具有代表性的湿润和干旱地区开展了一项试验，以确定牧场上虫卵孵化和幼虫存活的季节性模式。在两个地点的无寄生虫牧场上各设立了14个地块。每个地点每月用来自自然感染山羊的粪便污染一个地块，这些粪便中含有已知比例的捻转血矛线虫和蛇形毛圆线虫卵。污染后定期对牧场进行采样，鉴定并计数感染性幼虫。在湿润地区，这两种线虫的幼虫全年都有发育，但在干旱地区发育更为零散。9月至次年3月污染后的9周内，幼虫数量通常会降至检测水平以下，但在4月至8月较凉爽的天气里，幼虫存活时间会延长。本试验中观察到的相对较短的幼虫存活时间，可能为控制湿润热带地区寄生虫种群动态提供机会。
