Fabiyi J P, Copeman D B
Graduate School of Tropical Veterinary Science, James Cook University of North Queensland, Townsville.
Aust Vet J. 1989 Aug;66(8):240-2. doi: 10.1111/j.1751-0813.1989.tb13579.x.
Inhibition of development of gastro-intestinal trichostrongylid worms was studied using successive groups of tracer calves and groups of continuously grazed calves over one year in the Tully area of North Queensland lowland wet tropics. The results, assessed by means of worms from these calves recovered at necropsy 3 weeks after their removal from pastures, showed inhibition in the development of Haemonchus placei and Cooperia punctata at the early fourth stage at the approach to and during the relatively dry period in the area. Inhibition was however minor and inhibited larvae formed but only a small percentage of worm burdens in both categories of calves, indicating that they were not in any way of major epidemiological importance. It was suggested that the minor nature of inhibition was due to the mild climatic conditions which could not produce appropriate conditioning treatment, or caused only mild selection pressure for inhibition in the area.
在北昆士兰低地湿热带地区的塔利地区，使用连续几组示踪小牛和连续放牧一年的小牛群，研究了胃肠毛圆线虫发育的抑制情况。通过在小牛从牧场移走3周后尸检时回收的蠕虫来评估结果，结果表明，在该地区接近和处于相对干燥时期时，第四期早期的巴贝斯血矛线虫和点状库珀线虫的发育受到抑制。然而，抑制作用较小，在两类小牛中，受抑制的幼虫形成的虫负荷仅占很小的比例，这表明它们在任何方面都不具有主要的流行病学重要性。有人认为，抑制作用较小是由于温和的气候条件，这种条件无法产生适当的预处理，或者在该地区仅产生轻微的抑制选择压力。
