【摘要】 为检验EP-1不育剂对野外鼠类的施用效果,2004年在内蒙古锡林郭勒盟阿巴嘎旗白音图嘎800hm2草场进行了大田实验,并随后进行了逐月的夹线跟踪调查,分析了不育剂(EP-1)对黑线毛足鼠种群繁殖的效应。结果表明,EP-1不育剂对黑线毛足鼠种群繁殖的抑制效果良好,投药区与对照区相比,投药区黑线毛足鼠的子宫损伤率达到80%,平均胎仔数下降到对照区的2/3水平,妊娠率也下降到对照区的20%。但EP-1不育剂对雄鼠睾丸下降率的作用不明显。一次性投放EP-1不育剂,对黑线毛足鼠种群的繁殖作用时间可维持4个月以上,基本可实现对整个繁殖期的控制成效,这可能与黑线毛足鼠具有储藏种子的习性,储藏药饵多次进食有关。更多还原

【Abstract】 In this study we have assessed the effect of the EP-1 contraceptive compound(quinestrol,33.3%,and levonorgestrel 66.7%)on recruitment in a field population of the Djungarian hamster(Phodopus campbelli).We applied the EP-1 compound to a wheat bait at a ratio of 1∶10 000,in a 800 ha pasture in Abagaqi for the month of May 2004.An adjacent pasture was used as the control site.Wheat bait was delivered by 1.25 kg per hectare.A trapping census was conducted over 3 days each month from before baiting commenced in May through to September,to assess the reproductive status of the population of Djungarian hamsters.Our analyses show that EP-1 affects the reproductive success of the female hamsters.In the baited area,the EP-1 affected the uterus of 80% of mature females.The uterus was enlarged and remained oedematous for more than 4 months.Compared to the control area,in the baited area,the pregnancy rate and the litter size of females were reduced to 20% and 66% respectively.EP-1 had no effect on the proportion of males in the population with scrotal testes.Our study has shown that EP-1 affects the fertility of female hamsters for more than 4 months following a single application of the compound in the field in spring.This prolonged effect may be related to the food-caching behaviour of the Djungarian hamster.We conclude that EP-1 has the potential to control recruitment for the duration of the breeding season of the hamster.更多还原