Abstract: This experiment was conducted to study the effects of different proportions of black soldier fly larvae on growth performance, body size, slaughter performance and organ index of Magang goslings. Thirty-six 11-day-old healthy Magang geese with similar body weight were randomly divided into 4 groups with 3 replicates per group and 3 geese per replicate. The geese in groupⅠ was the control group and the geese in groupⅡ, group Ⅲ and group Ⅳ were fed the basal diet supplemented with 2%, 4% and 6% black soldier fly larvae, respectively. The feeding experiment lasted for 5 weeks. The results showed as follows:（1）compared with the control group, there were no significant differences in the average daily feed intake, average daily gain and feed to meat ratio of Magang geese in experimental groups（P>0.05）.（2）At 47 days of age, the shank circumference of geese in the group Ⅳ was significantly higher than that in group Ⅲ（P<0.05）, the chest depth of geese in the groups Ⅱ and Ⅲ was significantly higher than that in control group（P<0.05）, but there were no significant differences in other body size indexes.（3）Compared with the control group, there were no significant differences in the body weight, breast muscle weight and leg muscle weight of Magang geese in experimental group at 47 days of age（P>0.05）.（4）Compared with the control group, there was no significant difference in the organ indexes of Magang geese at 47 days of age in experimental groups（P>0.05）. （5）At 47 days of age, the Insulin-like growth factor 1（IGF-1）content in serum of geese in experimental group Ⅱ and group Ⅳ was significantly higher than that in control group（P<0.05）. The results indicated that supplementation of black soldier fly larvae did not affect the growth performance of Magang geese, but could improve the chest depth and shin circumference of Magang geese, and could also increase the content of IGF-1in serum of Magang geese.

Key words: black soldier fly powder, Magang geese, IGF-1, growth performance