Investigation and Control of Gasterophilus spp.Inffection on Equus ferus in Gansu Anxi Extreme-arid Desert National Nature Reserve
In order to understand the current infection situation of Gasterophilus spp.on Equus ferus in Gansu Anxi Extreme-arid Desert National Nature Reserve,and mastering larvae discharge dynamic and preventive effect of Equus ferus in the post-medication,we conducted pathological autopsies on five dead wild horses from 2020 to 2022 and counted the number of Gasterophilus spp.larva.In November 2022,Gasterophilus spp.larvae were collected and counted from the random fecal samples of 5 Equus ferus populations and all fecal larvae were collected from one population in the whole process after antiparasitic treatment.Besides,the dynamic models of Gasterophilus spp.larvae discharge were established by fitting the number of larvae discharge from the equids after taking insect repellents.The results showed that the infection rate of Gasterophilus spp.larvae was 100％among the five wild horses autopsied,and the highest infection intensity was 1 858.The parasitic larvae in the stomach accounted for 99.5％of the total number of infected larvae,and the infection intensity of foals＜subadults＜adults.The average deworming rate of Equus ferus after treatment is(26.8±10.8)per pile(feces.The curve fitting analyses revealed that larvae discharge of Equus ferus begun around 14.6 hours after taking vermifuge,reached its peak at 56 hrs,and basically ended at 119.7 hrs.The larvae discharge cycle lasted for 105 hrs.The results of this study provide technical support for precise pesticide application and effective prevention and control of Equus ferus gastrointestinal myiasis in the future.
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