Eysker M
Z Parasitenkd. 1981;65(3):343-51. doi: 10.1007/BF00926729.
Ewes were infected in November 1977 with third stage larvae of Haemonchus contortus which were conditioned for inhibited development at +15 degrees C for 35 days. Worm counts in December and May and weekly faecal egg counts revealed that the high burdens of inhibited larvae present in December virtually disappeared during winter, while the faecal egg counts remained low. This happened whether the ewes were pregnant or not. Indications of a slight postpartum rise in faecal egg counts, however, were observed in May in three out of five lactating ewes. After experimental reinfection of seven barren ewes and five lactating ewes in May 1978 a considerable resistance to H. contortus was observed in the barren ewes, while the resistance to reinfection was negligible in the lactating ewes.
1977年11月，母羊感染了捻转血矛线虫第三期幼虫，这些幼虫在15摄氏度条件下预处理35天以抑制发育。12月和5月的蠕虫计数以及每周的粪便虫卵计数显示，12月时存在的大量抑制性幼虫在冬季几乎消失，而粪便虫卵计数仍然很低。无论母羊是否怀孕，情况都是如此。然而，在5月，五头泌乳母羊中有三头出现了产后粪便虫卵计数略有上升的迹象。1978年5月，对七头空怀母羊和五头泌乳母羊进行实验性再感染后，观察到空怀母羊对捻转血矛线虫有相当强的抵抗力，而泌乳母羊对再感染的抵抗力可忽略不计。
