Slocombe J O
Can J Comp Med. 1974 Jan;38(1):18-21.
During 1970, 93 abomasa from cattle in Ontario were examined, and from 63 of these abomasa nematode species of the genera Ostertagia, Haemonchus and/or Trichostrongylus axei were recovered. The abomasa were from cattle six months to two years of age and were collected either from the postmortem room at the Ontario Veterinary College or from two abattoirs near Guelph. The numbers of worms per abomasum were estimated and their genera were identified from a one-twentieth volume of the washings and contents. The prevalence of Ostertagia species was estimated by examining random samples of adult male worms. Morphological variations in the species of the genera Ostertagia and Haemonchus were estimated by examining random samples of adult females. The predominant nematode was Ostertagia ostertagi. Other Ostertagia species recovered were O. trifurcata, O. lyrata and O. circumcincta. The numbers of nematodes recovered were generally low. Adult Ostertagia females had well-developed vulvar flaps. However, in abomasa where adult male O. trifurcata and O. lyrata were found, some adult female Ostertagia worms had reduced or no vulvar flaps. In two abomasa, adult Haemonchus females had large pendulous or "linguiform" vulvar flaps, and adult males had mean spicule lengths of 517 and 512 mu and were, therefore, unlike any of the recognized Haemonchus species.
1970年期间，对安大略省牛的93个皱胃进行了检查，从其中63个皱胃中发现了奥斯特他属、血矛线虫属和/或奥氏三齿线虫的线虫物种。这些皱胃取自6个月至2岁的牛，要么是从安大略兽医学院的尸体剖检室采集的，要么是从圭尔夫附近的两个屠宰场采集的。估计每个皱胃中的蠕虫数量，并从洗涤液和内容物的二十分之一体积中鉴定其属。通过检查成年雄虫的随机样本估计奥斯特他属物种的流行率。通过检查成年雌虫的随机样本估计奥斯特他属和血矛线虫属物种的形态变异。主要的线虫是奥斯特他线虫。回收的其他奥斯特他属物种有三叉奥斯特他线虫、琴形奥斯特他线虫和环纹奥斯特他线虫。回收的线虫数量通常较低。成年奥斯特他属雌虫有发育良好的阴门瓣。然而，在发现成年雄性三叉奥斯特他线虫和琴形奥斯特他线虫的皱胃中，一些成年雌性奥斯特他属蠕虫的阴门瓣减少或没有。在两个皱胃中，成年血矛线虫属雌虫有大的下垂或“舌状”阴门瓣，成年雄虫的交合刺平均长度为517和512微米，因此与任何已知的血矛线虫属物种都不同。
