Abstract: Objective To know the impact of the blowfly Chrysomya megacephala on different foods on their ovarian development and oviposition dynamics, to provide a theoretical basis for studying reproductive behavior of the flies. Methods After the adults emerged, the females were allowed to feed on pig manure, pork, cooked eggs and powder milk, and the development of the ovary was observed after feeding at different time. One-way analysis of variance (ANOVA)was used to compare the differences in ovarian developmental length when feeding on different foods. Results The flies that fed on cooked eggs and pork, completed ovary development on the 10^th and 5^th days respectively, while the ovarian development has not yet been seen until 20 days when flies fed on pig manure or powder milk. The ovary length of flies that fed on pork was greater than that in other three groups, the difference was statistically significant (1 d:F=13.054, ν=3, P=0.000; 3 d:F=84.584, ν=3, P=0.000; 5 d:F=42.065, ν=3, P=0.005). The female C. megacephala that fed on pork needed 5 d to complete the ovarian development and began to lay eggs; it began the first oviposition peak on the 7th day, then reached the highest of 16.6 mg on the 9th day, ranging 6.0-10.0 mg. Conclusion The adults C. megacephala which fed the pig manure and milk powder could not complete the ovarian development, the adults that fed on the cooked eggs were slow to develop ovaries. The ovarian development of the pork-feeding adults was the fastest; oviposition dynamics were affected by nutrient sources.

Key words: Chrysomya megacephala, Food, Ovarian development, Oviposition dynamics

摘要： 目的 了解大头金蝇取食不同食物对其卵巢发育的影响及产卵动态，为研究大头金蝇的生殖行为提供理论依据。方法 待大头金蝇成虫羽化后，大头金蝇雌虫取食猪粪、猪瘦肉、熟鸡蛋和奶粉，观察饲喂不同时间后其卵巢发育情况，并利用单因素方差分析比较大头金蝇取食不同食物后的卵巢发育长度差异。结果 大头金蝇取食熟鸡蛋和猪瘦肉，其分别在第10、5天完成卵巢发育，而取食猪粪或奶粉，第20天仍未见卵巢发育；猪瘦肉组的大头金蝇雌虫卵巢长度大于其他3组，差异有统计学意义（1 d：F=13.054，ν=3，P=0.000；3 d：F=84.584，ν=3，P=0.000；5 d：F=42.065，ν=3，P=0.005）。饲喂猪瘦肉的大头金蝇雌性成虫第5天就完成了卵巢发育并开始产卵，第7天进入首个产卵高峰，第9天时产卵达最高峰值为16.6 mg，之后产卵峰值在6.0～10.0 mg。结论 大头金蝇成虫取食猪粪和奶粉，其卵巢不能完成发育，取食熟鸡蛋其卵巢发育缓慢，取食猪瘦肉其卵巢发育最快；产卵动态受营养源影响。

关键词: 大头金蝇, 食物, 卵巢发育, 产卵动态