Abstract:

Effect of different feeds for young larvae on death rate, weight and developmental period were studied in dry conditions. Under the condition of 22~28℃, 30%-45% relative humidity, 8 kinds of food were supplied for the larvae before the 34 days-age, including 5% milk powder, 10% milk powder, 100% wheat bran, 2% maize powder, 4% maize powder, 60% wheat flour, 100% wheat flour or 100% corn flour, then 100% wheat bran was fed to all Larvae, even no water was added. The death rate and weight of Larva were determined at 34 and 161 days-age, and the number of pupation was determined every week. The results showed that: at 34 day-age, the results showed that the death rate and weight of Larva were significantly different, the death rate of feeding 100% maize powder group achieved maximum (44.0%), and its weight was minimum (0.677 mg/head), while the death rate of 5% milk powder was lowest (4.33%), and its weight was highest (1.804 mg/head). At 161 day-age, the weight of Larva was not significantly different, but the death rate of 5% milk powder, 10% milk powder or 100% wheat bran group was significantly lower than other group. In sum, supplementing protein-rich feed would decrease the death rate, elongate slightly the development period, centralize the pupating progress of larvae, but there was not significantly effect on weight of old Larva.