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Techniques for raising sterile fly
Flies are one of the "four pests" known for spreading diseases. However, with advances in science and technology, their remarkable reproductive capabilities and rich nutritional content have found new applications as a sustainable, high-protein feed source for the livestock industry. They are also used in medicine, health products, biochemistry, pesticides, and chemical manufacturing. Research has shown that dried fly maggot powder contains 59% to 65% crude protein, 12% fat, and 43.83% total amino acids—three times more than fishmeal. When fresh wolfberries are added to the feed, it increases fish yield by 22%, chicken egg production by 17% to 25%, pig growth rate by 19% to 42%, and saves feed by 20% to 25%. In this article, we will introduce the technology of using aseptic fly cages.
First, fly breeding requires a clean indoor environment with a temperature between 24-30°C, humidity of 50%-70%, and at least 10 hours of light per day. Fly cages, cage racks, thermometers, hygrometers, and ventilation systems are essential to prevent escape. Square fly cages, made of coarse iron wire or bamboo, are 50 cm in height and width, covered with plastic mesh. One side has a 20 cm diameter opening, which is usually tied shut. Three cages can be stacked, each capable of housing 1-1.5 million flies.
Sterile flies can be obtained from demonstration bases or cultivated from wild flies. The process involves sterilizing maggots and selecting healthy, large individuals (not big-headed flies) to place in the cage. The cage contains four functional components: water trays for daily use, food trays with a nutrient mix of sterile mash, brown sugar, yeast, and preservatives, egg-laying cylinders filled with bran water and attractants, and feathering cylinders for emerging flies.
The all-in, all-out method involves killing 20-day-old flies, processing them, and disinfecting the cages before starting a new batch. This ensures hygiene and prevents disease spread.
Second, cricket breeding follows similar conditions, with temperatures between 26-35°C and humidity of 65%-70%. Larvae don't need light and are raised in containers filled with 5-8 cm of mixed food, mainly animal manure. A ratio of 1 gram of fly eggs per kilogram of food is used, with 8-12 eggs hatching per kilogram of pig manure.
After five days, the crickets mature. They are separated from the food using methods like strong light screening or oxygen deprivation. After feeding, excess crickets are dried and processed into flour to replace fishmeal in feed. The material is sieved, and healthy individuals are selected for seeding. They can be stored in the refrigerator for up to 15 days, or moved indoors during winter for insulation.
Third, ecological farming integrates fly maggot breeding with raising livestock, poultry, fish, frogs, and even scorpions. This system creates a closed-loop cycle, where fly waste is used to grow fodder, and fly maggots serve as feed for chickens, rabbits, and other animals. This approach not only reduces waste but also enhances productivity and sustainability. It has proven highly effective in various agricultural settings, offering a promising model for eco-friendly farming.
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