Okon E D, Enyenihi U K
Trop Anim Health Prod. 1977 Feb;9(1):7-10. doi: 10.1007/BF02297381.
The development and survival of the eggs of Haemonchus contortus on pasture at Ibadan were studied by spreading faeces containing eggs on grass plots from October 1973 to October 1974. Development of the eggs to the infective larvae took place within one week in May, June, July, September and October. Larvae were not recovered in the other months. Their survival times were 28, 42, 42, 35, 63 and 49 days respectively in October 1973. May, June, July, September and October 1974. Rainfall was the most important epizootiological factor which influenced the development and survival of the infective larvae. Development of the eggs to the infective larvae took place when the mean daily rainfall for the first 7 days was 3 mm or more. The survival time of the larvae appeared to be prolonged when rain fell evenly throughout the periods the larvae were on pasture.
1973年10月至1974年10月，通过将含虫卵的粪便撒在草地上，对伊巴丹牧场捻转血矛线虫虫卵的发育和存活情况进行了研究。在1973年5月、6月、7月、9月和10月，虫卵在一周内发育为感染性幼虫。在其他月份未发现幼虫。1973年10月、1974年5月、6月、7月、9月和10月，它们的存活时间分别为28天、42天、42天、35天、63天和49天。降雨是影响感染性幼虫发育和存活的最重要的流行病学因素。当最初7天的日平均降雨量为3毫米或更多时，虫卵发育为感染性幼虫。当幼虫在牧场期间降雨均匀时，幼虫的存活时间似乎会延长。
