The aim of this study was to compare the effect of diets on the morphological parameters of different developmental stages of blowflies Chrysomya megacephala (Fabricius, 1794). Adult C. megacephala flies were collected from a goat cadaver and reared in the laboratory when the max and min temperature were 32 and 24 °C and the relative max and min humidity were ranged between 55 and 31% respectively. Blowflies at various feeding stages (first-, second-, and third-instar larvae) received different types of diets (meat, liver, fats, and mixed). The effects of the different diets on the life cycle duration and the morphological parameters of various stages were observed. The results revealed that the fat diet prolonged the post-mortem interval (PMI) up to 298.5 ± 1.15 hrs, whereas the mixed food diet shortened PMI to the 243.67 ± 0.12 hrs. Significant variation were observed at level (F = 740.71 df = 3P < 0.001). Furthermore, the mixed food diet significantly increased the morphological parameters (length, width, and weight) for almost all stages during the life cycle of blowflies. In contrast, the fat diet decreased these parameters to the lowest level. The present findings may provide a scientific basis for the determination of PMI.

本研究的目的是比较饮食对大头苍蝇不同发育阶段形态参数的影响(Fabricius, 1794)。C. megacephala成虫当最高和最低温度分别为 32 和 24 °C，相对最高和最低湿度分别在 55% 和 31% 之间时，从山羊尸体中收集苍蝇并在实验室中饲养。在不同饲养阶段（一龄、二龄和三龄幼虫）的苍蝇接受不同类型的饮食（肉、肝脏、脂肪和混合）。观察不同日粮对生命周期持续时间和各阶段形态参数的影响。结果显示，脂肪饮食将死后间隔 (PMI) 延长至 298.5 ± 1.15 小时，而混合食物饮食将 PMI 缩短至 243.67 ± 0.12 小时。在水平上观察到显着变化（F = 740.71 df = 3P < 0.001）。此外，混合食物饮食显着增加了形态参数（长度、宽度、和重量）几乎适用于苍蝇生命周期的所有阶段。相比之下，脂肪饮食将这些参数降低到最低水平。本研究结果可为PMI的测定提供科学依据。