Grant J L
J S Afr Vet Assoc. 1981 Mar;52(1):33-7.
Fifty-two untreated lambs from a contaminated flock were slaughtered at regular intervals throughout the year, and their gastro-intestinal tracts were examined for the presence of nematode parasites. Haemonchus contortus and Oesophagostomum columbianum were found to be of major importance. The incidence of Haemonchus rose to a peak and remained at a high level throughout the winter through the fourth larval stages of the parasite predominated at this stage. Oesophagostomum columbianum was recovered in numbers unusually high for this species, the incidence of which remained at a relatively high level from March until October. The minor genera recovered were Trichostrongylus spp., Cooperia spp., Strongyloides papillosus and Trichuris ovis.
全年定期宰杀来自受污染羊群的52只未经处理的羔羊，并检查其胃肠道是否存在线虫寄生虫。发现捻转血矛线虫和哥伦比亚食道口线虫最为重要。捻转血矛线虫的发病率升至峰值，并在整个冬季保持在较高水平，因为该寄生虫的第四幼虫阶段在此阶段占主导地位。哥伦比亚食道口线虫的检出数量异常高，其发病率从3月到10月一直保持在相对较高的水平。检出的次要属包括毛圆线虫属、库珀属、乳头类圆线虫和绵羊鞭虫。
