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1.实验证明,在北京地区的自然坏境中猪蛔虫卵从4月至10月都能进行发育,5月至9月间能发育成侵袭性幼虫期卵。在背阳光条件下为6月至8月。实验证明,各期虫卵都能够越冬,并且保持侵袭能力。 2.虫卵发育速度最快的月份为7、8两月,土层深度为3—20厘米。土层的温度范围为24.5—39℃(平均26.3—33.3℃),含水量为9.5—19%。虫卵可于2星期内发育至侵袭性幼虫期卵。 3.实验证明,在北京地区,散布在土层3厘米以上的虫卵,由于湿度过低(含水量5%以下)或温度过高(42.5℃以上),造成虫卵不能发育成侵袭性幼虫期卵。但在背阳的条件下,在7、8月份的流行季节里,土表层由于温度、湿度均较适宜,虫卵能完全发育成侵袭性幼虫期卵。 4.在北京地区,在3厘米以下的土层,平均温度不超过33.3℃、含水量不小于9%时,虫卵有89%能发育成侵袭性幼虫期卵。 5.根据实验结果,对猪蛔虫病的防治问题进行了讨论。
1. Experiments show that in the natural environment in Beijing pig Ascaris eggs can develop from April to October, from May to September can develop into an aggressive larvae eggs. In the back sunshine conditions from June to August. Experiments show that all stages of the eggs are able to winters, and maintain the invasive ability. 2. Egg development fastest month for 7,8 two months, soil depth of 3-20 cm. Soil temperature ranged from 24.5-39 ° C (average 26.3-33.3 ° C) and water content 9.5-19%. Eggs can develop to aggressive larval stage eggs within 2 weeks. 3. Experiments show that in Beijing, the eggs scattered over 3 cm in soil layer can not develop into aggressive larvae due to the low humidity (below 5% water content) or over-temperature (over 42.5 ℃) Egg. However, in the sunny conditions, in July and August in the popular seasons, the soil surface due to temperature and humidity are more appropriate, the eggs can fully develop into an aggressive larvae eggs. 4. In Beijing, the soil below 3 cm, the average temperature does not exceed 33.3 ℃, the water content of not less than 9%, 89% of the eggs can develop into aggressive larvae eggs. According to the experimental results, the prevention and treatment of Ascariasis in swine were discussed.