Drosophila or often called "fruit flies” are very suitable for swiftlet. These insects have a high protein and you can attact & breed these insects by following:
1)1KG oatmeal/careal powder (you can buy cheap cereal, and then blend it)2) 1KG of soybean meal (can use flour, but not very effective
3) 0.25k KG milk
Mix items 1, 2, 3 & 4. Cereal flour, soybean flour, milk, chicken or pig diets provide adequate vitamin and minerals for Drosophila to growth.
Later add hot water to these materials and mix evenly. You can also add a little baking powder to attract Drosophila.
After completion pour it into the bucket place in roving room. Drosophila will be attracted to the smell & begin to lay eggs, then into larva, the pupa and then into Drosophila.
Remember to ensure the food is always wet & add some water to it went necessary. The breeding insects will be continue until your food is gone.