Fukumoto S, Etani K, Toi K, Hanadate M, Hidaka M, Yokoya K, Hiramatsu T, Iguchi T, Kudo S, Miyamoto K
Department of Veterinary Parasitology, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan.
Nihon Juigaku Zasshi. 1990 Apr;52(2):379-85. doi: 10.1292/jvms1939.52.379.
The prevalence and intensity of infection with abomasal nematodiasis was studied in dairy cattle of Hokkaido, northern Japan, for successive two years. During the period of March in 1985 to September in 1987, a total number of 393 abomasa of Holstein-Friesian cows was examined for nematode parasites. Nematodes were detected from 75% of the cows. The prevalence of nematode species detected was Ostertagia ostertagi 250 (63.6%), Mecistocirrus digitatus 181 (46.1%), Trichostrongylus axei 85 (21.6%) and Haemonchus sp. 1 (0.3%). The prevalence and population composition of each growth stage varied seasonally in O. ostertagi and M. digitatus. The large percentage of arrested larvae, early L4 O. ostertagi and immature L5 M. digitatus, detected during the mid-winter and the increasing percentage of matured adult populations of both species in early spring revealed the occurrence of the autumn associated arrested development (hypobiosis) phenomenon in bovine abomasum nematodes of Japan.
连续两年对日本北部北海道的奶牛真胃线虫感染的流行情况和感染强度进行了研究。在1985年3月至1987年9月期间，共检查了393头荷斯坦-弗里生奶牛的真胃中的线虫寄生虫。75%的奶牛检测到线虫。检测到的线虫种类的流行率为：奥斯特他线虫250头（63.6%）、指形长刺线虫181头（46.1%）、艾氏毛圆线虫85头（21.6%）和血矛线虫属1头（0.3%）。奥斯特他线虫和指形长刺线虫各生长阶段的流行率和种群组成随季节变化。在冬季中期检测到大量的滞育幼虫、早期L4阶段的奥斯特他线虫和未成熟L5阶段的指形长刺线虫，以及这两个物种在早春成熟成虫种群百分比的增加，揭示了日本牛真胃线虫中与秋季相关的滞育发育（低生物活性）现象的发生。
