CATDOLL : CATDOLL: Technology for breeding fly maggots

1. Technology of maggot breeding

Fly maggots and fly pupae have high feeding value. According to analysis, dry maggots contain 39%-63% protein, 12.6% crude fat, and a certain amount of calcium and phosphorus. Artificial breeding of fly maggots can greatly reduce the cost of feed production.

1. Adult rearing ① Equipment. Fly cage: A 50 cm × 50 cm × 50 cm bracket made of iron or wooden bars, covered with plastic or window screen, with an operating hole of 12 cm to 15 cm in diameter on one side. Each fly cage is equipped with a drinking cup, three or four feed trays, and an egg-laying tank. Fly maggot culture tray: Made of plastic or iron sheet, the number depends on the scale of breeding. The size is preferably 5 kg of culture medium per tray. The culture tray is generally 10 cm high on each side, and the thickness of the culture medium is preferably 3 cm to 5 cm. ② Feed preparation. The food of adults is mainly young maggots. First, grind the fresh maggots with a meat grinder (the diameter of the wall hole is 1.0 mm to 1.5 mm), and then mix them according to the following proportions: 95% maggot paste, 5% brewer's yeast, and 150 ml of water. ③ Rearing technology. Put the breeding flies into the fly cage (when the breeding pupae are about to hatch, put them together with the hatching tank). The stocking density is calculated based on the average space of 10 cm3 occupied by each adult in the cage. At least 12,000 flies can be placed in each cage. When 5% of the flies have hatched and the male and female have begun to mate, they can be placed in the egg-laying tank. The egg-laying tank is an opaque container with an appropriate amount of bran. For easy management, adults should hatch a batch every 7 days. The egg-laying capacity of adults is up to 1,000. After about 12 to 15 days, the egg-laying capacity can be eliminated after the egg-laying capacity decreases. The method is very simple. After taking out the bait and water, they will starve to death two days later, or be scalded to death with boiling water. Dead flies can be directly fed to poultry, or dried and crushed, and mixed into feed.

When operating, please note that the room temperature should be controlled at 24℃-30℃, and the humidity should be controlled at 50%-80%. Every morning, take out the two bait trays (one for brown sugar and one for maggot slurry) and a drinking water tank in the fly cage, rinse them clean, and then put in the bait. In order to reduce the number of flies escaping, it is also advisable to take out the fly eggs at this time and move them to the larvae room for cultivation. Put about 40 grams of brown sugar in the sugar tray each time, and change it every 2-3 days. Once is enough.

Flies can spread many diseases, so during the culture process, be careful to prevent the flies in the cage from escaping. A buffer room should be set up outside the adult room, and there should be a fly-killing device inside to lure and kill individual adult flies that fly out.

2. Larvae (maggot) breeding 2.1 Preparation of culture medium. Mix 30% chicken manure, 70% wheat bran or all chicken manure and pig manure, and add water to prepare a culture medium with a moisture content of about 15%. 2.2 Inoculation of eggs. Place the prepared culture medium in a fly maggot culture tray with a thickness of about 3 cm to 5 cm (no more than 3 cm in summer), and then inoculate 4 grams of fly eggs per 5 kg of culture medium. The inoculated culture medium can be placed in a culture room at 22℃-25℃ for culture. 2.3 Separation of fly maggots. Fly eggs can hatch into maggots after 8 hours to 12 hours in the culture room, and become pupae after 5 days to 6 days. As feed for livestock and poultry, they can generally be harvested as a product from the 4th day after the larvae hatch. The harvesting method is: taking advantage of the light-avoiding properties of fly maggots, place the culture medium under strong light, and the maggots will drill into the bottom layer of the culture medium,

At this time, remove the upper culture medium, pour the remaining culture medium into the gauze sieve, rinse it repeatedly in water, and you can get clean maggots.

2. Breeding of fly maggots

Fly maggot breeding technology refers to the collection of technologies used in the fly maggot breeding process.

The larvae of houseflies are called maggots, which are high-quality animal protein feed. The nutritional content of maggots is similar to that of high-quality fish meal. When maggot meal is fed to laying hens, their egg production rate is increased by 20% compared with laying hens fed the same amount of fish meal, and the feed conversion rate is increased by more than 15%. The breeding of maggots is divided into two stages: breeding of seed flies and breeding of maggots. Breeding of seed flies is to obtain a large number of fly eggs for breeding maggots. The eggs produced by chickens that raise maggots are rich in various vitamins and carotenoids. The fat content of eggs is generally no more than 3%, and the protein content exceeds 12%. It contains a variety of amino acids, sodium, potassium, calcium and other minerals necessary for the human body.

3. What are the most common problems in maggot farming?

1. Egg hatching

At 20-22℃, incubation takes 24 hours; at 25℃, it takes 16-18 hours; at 28℃, it takes 14 hours; at 35℃, it takes 8-10 hours.

The most suitable humidity is 70%-80%.

2. Hatching of pupae

Within the suitable range, as the temperature rises, the pupal stage shortens accordingly. At 16°C, it takes 17 to 19 days; at 20°C, it takes 10 to 11 days; at 25°C, it takes 6 to 7 days; at 30°C, it takes 4 to 5 days; at 35°C, it only takes 3 to 4 days, which is the optimal development temperature.

Pay attention to the temperature during winter breeding. When the temperature is lower than 12°C, the pupae will stop developing; when the temperature is higher than 45°C, the pupae will die.

Flies become sexually mature four days after emergence and begin to mate and lay eggs. The life span of flies is up to one month. In actual production, each batch of breeding flies is promptly eliminated after 20-25 days of breeding. Under artificial conditions, as long as the temperature is suitable, flies can reproduce all year round.

There has always been a misunderstanding in the fly breeding industry that the bigger the seed, the better, so many people sieve the seed pupae and only keep the big ones for use. By chance, we found that the yield of seed flies after all the big pupae have emerged is not high. Why is this? Through continuous comparative experiments, we found that the artificial method of removing the small and keeping the big destroys the male-female ratio of the population itself, resulting in more females and fewer males. Flies are precisely "monogamous", that is, after each pair of flies mates successfully, the male fly will die (female flies only need to mate once in their lifetime). This leads to the fact that if there are many female seed flies in a population, but there are not enough males to mate with them, they will not be able to lay eggs, so the egg-laying capacity of such a population cannot be increased. The natural population is the same batch of species, with a moderate size ratio, preferably half each.