English A W
Aust Vet J. 1979 Jul;55(7):306-9. doi: 10.1111/j.1751-0813.1979.tb00415.x.
The seasonal changes in longevity on herbage of the infective larvae of strongylid nematodes of the horse were studied. During the summer months, 1% of the larvae survived on herbage for 2-3 weeks, with 0.2% still viable for a further 2-3 weeks. Equivalent survival periods in winter were 7-11 weeks and over 11 weeks respectively. During spring and autumn, larvae survived for periods varying from 3-8 weeks. On Rhodes grass (Chloris gayana) growing vigorously in the summer of 1976, the majority of larvae remained in the lowest layers of the pasture, within 10 cm of the soil surface. Very few reached the highest fraction of grass sampled, above 40 cm from the soil. More larvae were recovered higher on the pasture in a period when less torrential rain had occurred. It was concluded that the parasitological benefits to be gained from short-term mixed grazing with horses and cattle may be minimal, in view of the tendency of cattle to eat only the upper layers of the pasture initially, with a consequent increase in the number of infective larvae per unit weight of herbage remaining.
对马的圆线虫感染性幼虫在牧草上的存活时长的季节性变化进行了研究。在夏季月份，1%的幼虫在牧草上存活2 - 3周，其中0.2%在接下来的2 - 3周仍具活力。冬季的相应存活期分别为7 - 11周和超过11周。在春季和秋季，幼虫存活时长从3 - 8周不等。在1976年夏季生长旺盛的罗德草（Chloris gayana）上，大多数幼虫留在牧场的最底层，在距土壤表面10厘米范围内。很少有幼虫能到达所采样牧草的最高部分，即距土壤40厘米以上。在降雨较少的时期，在牧场较高位置能回收更多幼虫。鉴于牛最初倾向于仅食用牧场的上层，从而导致每单位重量牧草中剩余的感染性幼虫数量增加，得出结论：马和牛短期混合放牧在寄生虫学方面获得的益处可能微乎其微。
