关键词: 马胃蝇蛆, 排虫动态, 拟合, 排虫高峰

Abstract: Objective The discharge dynamic models of Gasterophilus spp. larvae were established by fitting the number of larvaeshedding from the equids after taking ivermectin. According to the models, the peaks of larvae discharge were predicted, which could help the collection of fresh maggots. Methods Three domestic horses and three Przewalski's horses were randomly selected and were kept in small enclosures separately. Maggots of each animal was harvested per unit time after taking ivermectin, the average rates of discharge larvae were calculated for both domestic and Przewalski's horses. Quadratic, Compound and Cubic models were used to fit the dynamics of larvae discharge. Results Among the three fitting models, the Cubic models were the best models to fit the discharge rate of the larvae (domestic horses:adjusted R²=0.837; Przewalski's horses:adjusted R²=0.940). The regression equations of the dynamic fitting of domestic and Przewalski's horses were:Y_d=-1.302 766+0.075 436t-0.001 177t²+0.000 006t³ (27.6 ≤ t ≤ 87.9), Y_p=-1.178 999+0.071 902t-0.001 157t²+0.000 006t³ (25.7 ≤ t ≤ 84.7). According to the regression equations, the peak values of domestic and Przewalski's horses were 49.0 h and 47.1 h. Conclusion The efficacy was not related to the equine species and infection intensity of Gasterophilus spp. larvae. The regression equation quantified the early observations, the conclusion could help to improve the collection efficiency and obtain fresh maggot samples, which laid a foundation for further study.

Key words: Gasterophilus spp.larvae, Larvae discharge dynamics, Fit, Peak of larvae discharge