Fly culture technology

As we all know, flies are insects that can transmit a variety of bacterial viruses, which will bring germs to food and do harm to human health. Therefore, flies have always been eliminated. The fly often haunts the dirtiest places. Why doesn't it get sick? This phenomenon gives scientists an inspiration. Studies have found that there are a variety of antibiotics, antimicrobial peptides and other antibacterial substances in flies, which can resist or even destroy bacteria. We can make use of them reasonably, do a good job of prevention, and also benefit mankind. Experiments show that fly maggots do not contain any toxins and can be safely eaten, and their protein content is high and vitamin E content is also high. Dried fly maggots can be used as protein feed for poultry, aquatic products and other animals, which is favored by the majority of farmers. There are many species of flies, and the engineering fly has the highest nutrient protein content and culture yield.

The growth process of flies

The growth process of flies is divided into four stages: eggs, maggots (larvae), pupae and flies (adults).

1. Eggs: after hatching, after 3 to 5 days of artificial feeding, the flies begin to mate, reproduce and lay eggs, and the spawning period is 5-10 days; the feed for receiving eggs should be fermented ahead of time to master the degree of moisture and its proportion; after the eggs are extracted, they immediately enter the hatchery for hatching, and the temperature, humidity and ventilation time of the hatchery are adjusted according to the season. The incubation time of fly eggs is usually 8-24 hours. After the hatching is completed, they can be prepared to be cultured in maggot ponds.

2. Maggots (larvae): species are distributed according to the density of hatched larvae (Note: the density of larvae is too small, the development and growth of larvae is large, but the yield is too low; the density is too high, which leads to insufficient nutrition, and the maggots become smaller). The proportion of grass roots in maggot ponds (fresh pig manure can not be too much or too little, grass roots not mastered properly will seriously affect the development and growth of larvae, and even lead to death) Maggots mature in about 4 days in summer and 6-8 days in winter. According to current maggot culture techniques, maggots can be cultured all the year round.

3. Pupa: after maturing, the fly maggot climbs into a drier environment, shrinks back and forth into a pupa, and its body color changes from light to dark, and finally to chestnut brown; it takes 2-4 days for the maggot to change into a pupa; the thick maggot pupa can keep the seed to ensure the reproduction rate of the next generation and prolong the spawning period. Circular culture.

4. Flies: when the body color of the pupa changes to chestnut brown or black, we start to hatch flies. At this time, we must gently put the pupae into the fly tent; the number of pupae should be determined according to the size of the fly tent, and the density should not be too high. When the front end of the pupa shell breaks and the fly crawls out of the rupture, it needs to go through five stages of "stillness-crawling-stretching-winging-body wall hardness" in order to develop into an adult fly with the ability to fly, feed and reproduce. After the peak spawning period, flies are generally treated within 12-16 days for renewal.

Breeding techniques of seed flies

1. Seed fly room. It is required that the indoor air is fresh, the temperature is kept at 24-30 ℃, the relative humidity is 50%, the relative humidity is 70%, and the light is illuminated for more than 10 hours a day. There are fly cages, cage racks, temperature and hygrometers and heating exhaust air escape prevention and other equipment.

2. Making fly cage. Square fly cages of 50 cm in height and 50 cm in width are made of thick iron wire or bamboo strips, which are covered with plastic gauze, in which an operating hole of 20 cm in diameter is left on one side, and the orifice seams according to a 30 cm long cloth tube, which is usually tied tightly. Three-layer fly cages are placed on the cage rack, and each cage can raise 1-15000 flies.

3. The source of species fly. The first batch of aseptic flies can be introduced from the demonstration base or cultivated by wild flies by themselves. The method is to sterilize the pupae produced by maggots or excavated pupae, and then select a large and full one (no big head flies) to feather them into a cage to become aseptic flies.

4. Feeding method. The purpose of captivity is to allow female flies to concentrate on laying eggs. There are four kinds of plates or jars with different functions in the cage: first, the water plate: specially for seed flies to drink water, which is changed once a day; second, the food plate: the nutritious food made of aseptic maggot, brown sugar, yeast, preservatives and water is changed once a day; the third is the spawning tank: the tank is equipped with a mixture of wheat bran, water and attractant to attract female flies to lay eggs, and the feed and eggs are moved into the larval breeding basin every day. The fourth is the Eclosion tank: it is designed for putting the seed pupae that are about to Eclosion when changing generations.

6. Seed flies are eliminated. The full-in and all-out breeding method is implemented, that is, all 20-day-old species flies are killed, and then processed into fly powder for spare, and the fly cages are disinfected and then used to cultivate the next batch of new species flies.

Culture techniques of fly maggots

1. Maggot breeding room. Similar to the fly room, the room temperature is kept at 26-35 ℃, and the humidity is 65% and 70%. There are maggot rack, maggot basin, temperature and hygrometer and heating facilities in the room. The larvae are afraid of light and do not need light.

2. Feeding method. The maggot basin is first filled with a mixture of livestock manure 5-8 cm thick, with a humidity of 65% Rue 70%. Then, according to the proportion of 1 gram of fly eggs per 1 kg of food, the eggs hatch into maggots after 8-12 hours, and 0.5 kg of fertile maggots per 1 kg of pig manure.

3. Separation of maggot feces. The maggots have matured after 5 days of rearing. In addition to leaving the seed to turn into pupae, the maggots used as feed should be collected and utilized by using the "strong light sieve method" or "hypoxia method" to force them to escape from the food for separation. After fresh feeding, the remaining maggots are roasted and processed into maggot powder, and then the pupa species of mixed feed prepared by fish meal can be selected and retained. After maggots are pupated, the pupa material is separated with a sieve net, and then a large full pupa is selected to keep the seed; the pupa that is not in use can be stored in the refrigerator for 15 days; in winter, the pupa should be moved indoors to keep warm for the winter.