Ogunsusi R A
Res Vet Sci. 1979 Mar;26(2):189-92.
Monthly worm counts of groups of ewes and lambs that grazed continuously and tracer lambs revealed that under the conditions existing in northern Nigeria, most of the Haemonchus contortus in sheep between November and March were arrested larvae. During the months of April and May, almost equal proportions of adults, developmental stages and arrested larvae were recovered and, by June, only adults and developmental stages were recovered in high numbers. The proportion of arrested larvae had diminished considerably. A similar pattern was recorded for Trichostrongylus spp, except that fewer larvae were involved in arrested development and very large numbers of adults were recovered throughout the duration of the study. Maturation of arrested larvae occurs in April.
对持续放牧的母羊和羔羊群体以及追踪羔羊进行的月度蠕虫计数显示，在尼日利亚北部现有的条件下，11月至3月期间绵羊体内的大多数捻转血矛线虫是滞育幼虫。在4月和5月期间，回收的成虫、发育阶段和滞育幼虫比例几乎相等，到6月时，仅大量回收了成虫和发育阶段的虫体。滞育幼虫的比例大幅下降。毛圆线虫属也记录到了类似的模式，只是参与滞育发育的幼虫较少，并且在整个研究期间回收了大量成虫。滞育幼虫在4月成熟。
