Detailed Explanation of Key Points of Aseptic Fly Maggot Breeding Technology

    With the rapid development of the breeding industry, the demand for high-protein feed is increasing everywhere. Artificial breeding of aseptic fly maggots has opened up a new path for the development and utilization of high-protein feed for animals.

In one cubic meter, more than 10 boxes can hold 12,000 aseptic fly breeding stock, which consume only 20 grams of milk powder per day. The eggs produced each day are placed in 4 kg of wheat bran for breeding, and by the fourth day the maggots can be collected to feed frogs, forest frogs, pond catfish, seven-star fish, geckos, scorpions, etc. Eggs are produced every day and maggots are available every day. One cubic meter housing 12,000 fly breeding stock can produce more than 2 kg of maggots per day, and during the normal egg-laying period from day 1 to day 5, the maggots produced can reach 5-6 kg per day. The equipment is simple: only a 6-meter fishing net is needed to make a net cage, and with a dozen or so trays, mass production is possible. It is extremely easy to raise, and after one introduction of breeding stock, you can keep your own stock and expand.

1. Living Habits of the Housefly

At room temperature of 20°C-30°C and relative humidity of 60%-80%, the housefly develops over five days, changing from soft to hard, from cream yellow to light brown to dark brown to black, and finally the adult fly breaks out of the front end of the pupal shell. The newly emerged adult fly can only crawl, not fly; after one hour, it spreads its wings and begins to eat and drink. Adult flies are lively and active during the day, and rest motionless at night. After three days they reach sexual maturity, and males and females begin to mate and lay eggs. From 1 to 8 days of age is the peak egg-laying period, and by 25 days of age they basically lose the ability to lay eggs. Fly eggs hatch into maggots in half a day to one day. Maggots cultivated in pig and chicken manure generally become pupae on the fifth day. One generation of the fly is about 28 days. Temperature and the nutrients in the bait have a great influence on the growth and development of maggots. Generally, within the room temperature range of 20-30°C, the higher the temperature and nutrients, the faster the maggots grow and develop, and the larger the pupae they become.

2. Rearing of Breeding Flies

Breeding flies should be kept in a fly house. The size of the breeding fly house should be built according to need, or an old house can be modified. Glass and screen windows are installed on doors and windows to help regulate temperature, and fans are installed on the walls to regulate air. Heating equipment should be provided in the house to keep the winter temperature at 20°C-32°C and the relative humidity in the house at 60%-70%. Black cloth curtains are hung in the passage to prevent breeding flies from escaping. Rearing racks are set up in the house, divided into upper, middle and lower tiers. The rearing racks are made of iron or wood. On each tier are placed fly cages made of nylon gauze netting, with cages 100 cm long and 80 cm high. The breeding flies are kept in the cages for rearing, with 12,000 breeding flies per cage. Each cage is fitted with a cloth sleeve for adding feed, adding water and collecting eggs. 12,000 adult flies are fed 20 grams of milk powder per day. The feed is placed in a feed basin with a gauze pad surface, allowing the adult flies to stand on the gauze and feed on the feed and water, which is changed once a day. Gauze is placed in the water basin, and wet wheat bran is placed in the egg-laying tray for the breeding flies to lay eggs. Eggs are collected from the breeding flies once a day and sent to the maggot room for maggot rearing. Breeding flies lay the most eggs from 8 a.m. to 3 p.m. each day, so the egg collection time should be appropriate. Each batch of breeding flies is kept for 15-20 days and then culled. They are killed with hot water or steam, dried and ground into powder as feed for livestock and poultry, and then a new batch is introduced.

3. Cultivation of Fly Maggots

For fly maggot breeding, brick-walled maggot beds with a side height of 20 cm and an area of 1-3 sq m can be used, or wooden racks with plastic trays can be used for maggot rearing. A plastic tray with a diameter of 50 cm can rear 1.5 kg of maggots and requires only 3 kg of wheat bran; after 3-4 days they can be collected and used. The sources of maggot feed are relatively wide, and the cost of different maggot feeds varies, so they can be reasonably selected. Wheat bran has relatively high nutritional content, somewhat higher than that of various grades for humans, and is generally used to breed breeding flies. Low-priced distiller's grains, soybean dregs, etc. can be used as commercial maggot feed. If wheat bran is used as maggot feed, generally 1 kg of wheat bran can produce 0.5 kg of fly maggots. When using it, water must be added and mixed evenly; the appropriate dryness and wetness is that water is squeezed out when held in the hand and it crumbles when touched. If there are semi-dry and semi-wet materials such as distiller's grains and soybean dregs, they can be used for cultivation without adding water. Specific maggot rearing method: pour the fly eggs and wheat bran material into the tray, add maggot feed such as distiller's grains, soybean dregs or wheat bran, and mix briefly. Note that the fly eggs should not be exposed on the surface of the maggot feed, so as to avoid dehydration and loss. The thickness of the maggot feed should be based on the standard that the fermentation temperature inside the maggot feed is not higher than 40 and not lower than 20, generally 5-10 cm. In summer when the temperature is higher, the maggot feed should be appropriately thinner; conversely, in winter when the temperature is lower, the maggot feed can be appropriately thicker. If human and livestock manure is used, it must be used after killing bacteria and parasites. As for the ratio of material to maggots, taking chicken manure as an example, generally 3.5-4 kg produces 0.5 kg of fresh maggots. Regardless of which raw material is used for rearing maggots, the dryness and wetness of the maggot feed should be controlled at 60%-65%.