The technique of raising fly maggots with wheat bran

At present, the agricultural industry is developing more and more rapidly, and supply exceeds demand. In order to find the agricultural industry faster and better, the maggot breeding industry has sprung up. Maggot breeding has successfully promoted the development of the agricultural industry and improved the quality of the agricultural industry. Let's talk about the maggot breeding technology.

The technique of raising fly maggots with wheat bran

It is recommended to add a certain amount of straw and feces when fermenting wheat bran. This can reduce the cost to a certain extent and avoid a large amount of sour taste caused by the fermentation of wheat bran alone.

1. Pig manure fermentation. In general, 1 kg such as golden pig manure starter can ferment 1.5 tons of pig manure (about 3 tons of fresh manure). The starter should be mixed and diluted with rice bran (or corn flour or wheat bran) at 1:5, sprinkle it evenly into the pig manure pile and mix evenly. Adjust the moisture content of the fermentation material to 60% to 65%. Judgment method: hold on to a handful of material by hand, and if you see the watermark in your fingers without dripping, it is appropriate to disperse when you land on the ground. The pig manure mixed with golden pig manure starter should not be too small (1.2 to 1.5 meters high, 2 meters wide and 2 meters long). In the process of fermentation, attention should be paid to turning it over 2 times and controlling the temperature at about 65 degrees Celsius. Generally, fermentation can be completed within one week.

2. Collect eggs. Send the fermented pig manure to the maggot room, the pile grows 0.8 meters, 0.2 meters wide, 0.15 meters high long strips, on the dung pile on the collection of eggs, each put three small piles. The formula of egg collection is: 100 kg of dung: 1 kg of wheat bran, 2 taels of fish meal, 3 taels of peanut bran, 1.5 kg of water, which can be mixed and put on the dung pile. After putting on the egg collection, it is forbidden to walk in the maggot house.

3. Collecting maggots. At 25-35 ℃ at room temperature, the eggs usually hatch into small maggots after 8 hours. In the process of fermentation, such as the functional probiotics contained in the fermented pig manure starter, the functional probiotics can inhibit the growth of harmful bacteria; moreover, the high temperature produced by fermentation can kill parasites and heat-labile pathogens, creating a healthy environment for the hatching and growth of young maggots. The little maggots will first eat the egg collectors and then drill into the dunghill to grow. The nutrition of fermented pig manure is balanced, and the nutrients are more easily digested and absorbed by maggots, which can ensure the nutritional needs of rapid growth. The peak period of climbing out is 72-96 hours after hatching, which can be collected. Generally, the maggots in the dung pile can be basically crawled and collected on the 4th day after being put into the dung.

How many jin of wheat bran produces a jin of fly maggots?

100 kg of wheat bran, the total crude protein is 15 kg, the crude fiber of wheat bran is 9.5%, that is to say, at least 9.5% of the wheat bran cannot be recycled into fly maggots, and 70% of the 15 kg crude protein can be recovered. So it is estimated that about 10 kg of protein is recovered (there must be a lot of protein in the wheat bran after breeding fly maggots). The crude protein of dry fly maggots is generally about 65%, so it is calculated that it can produce about 16 kg of dry fly maggots, assuming that every 4 kg of fresh fly maggots are dried into 1 kg of dry fly maggots, up to 64 kg of fresh fly maggots can be produced. This is almost the highest output.

Why raise maggots?

An important part of ecological agriculture. The addition of fly maggot breeding to the material recycling of ecological agriculture can successfully solve the two difficult problems of fecal pollution and feed shortage that plague livestock and poultry production. Livestock and poultry digest and absorb only 60% of feed nutrients, and the rest are lost in feces, which are rich in protein and other nutrients. Fly maggots can digest and absorb almost all the nutrients lost in feces and convert them into insect protein. Other insects are incompetent, but maggots can carry this burden. In the aquaculture industry, the insect breeding industry is increased outside the planting industry, which prolongs the food chain, transforms the material and energy to a higher quality, becomes a substance that can be used by its higher animals, and improves the utilization rate of resources.

Problems in breeding fly maggots with wheat bran

The first obstacle is that wheat bran is easy to turn sour, which is a problem encountered by many people. The wheat bran mixed yesterday afternoon was found to have an obvious sour taste this morning, and the maggots stopped eating it. Because the PH required for food by fly maggots is 6.2-8, and foods less than 6.2 will refuse to eat, if the wheat bran is fermented or fed directly with EM, there will be a problem: EM is a microorganism, and microorganisms will reduce the PH value in the material during fermentation, even if it is not fermented and mixed directly, too much will lead to faster acidification of wheat bran. As mentioned earlier, wheat bran naturally decreases its PH value after adding water, so why are there fewer problems in the high temperature season, but when the temperature is below 25 °? This is because when the temperature drops, the eggs laid by the flies take longer. For example, when the ambient temperature is 22-25 °, it takes 36-24 hours to hatch, and the wheat bran is already acidified. After hatching, the maggots have lost their appetite for wheat bran or began to have some appetite, but over time, the wheat bran becomes more and more sour, so the maggots eat only a small amount of wheat bran or no wheat bran at all. And why doesn't animal feces have this acidification problem? Because the PH value of animal feces is generally 7.5-8, even with microbial fermentation, it will not drop below 6.5.

The second obstacle is the crude fiber in wheat bran. We know that the crude fiber in wheat bran is 9.5%. We also know that fly maggots have no teeth and rely on nutrition, so there is nothing they can do about crude fiber food. In the suitable high temperature season (33-35 °), when we put 40g, 50g and 60g eggs in 5 kg of wheat bran, the weight of maggots and the weight of wheat bran residue are basically the same. it's just that the individual size of the maggot is different (the more eggs, the smaller the maggot). This shows that maggots have only so many available nutrients in wheat bran and there is nothing they can do about crude fiber.

The third obstacle is that the crude protein in wheat bran is not high. According to the law of conservation of matter, the average crude protein of wheat bran is about 15%. After raising fly maggots, the total crude protein of fly maggots is generally within the sum of the crude protein in the material you put in. You can calculate, for example, if you put in 100 kg of wheat bran, the total crude protein is 15 kg and the crude fiber of wheat bran is 9.5%. In other words, at least 9.5% of the wheat bran cannot be recycled into fly maggots, and 70% of the 15 kg crude protein is the highest. So it is estimated that about 10 kg of protein is recovered (the wheat bran after breeding fly maggots must also contain a lot of protein). The crude protein of dry fly maggots is generally about 65%, so it is calculated that it can produce about 16 kg of dry fly maggots, assuming that every 4 kg of fresh fly maggots are dried into 1 kg of dry fly maggots, up to 64 kg of fresh fly maggots can be produced. This is almost the highest yield, and it is nonsense for those who say that one kilogram of wheat bran produces one kilogram of maggots (which violates the law of conservation of matter). In addition, the energy of wheat bran is very low, the digestible energy is only about 9 megajoules / kg, the content of metabolic energy is about 7 megajoules / kg, and the lack of starch in wheat bran affects the synthesis of glucose, while the metabolic energy content of corn is 12.9 ~ 14.5 megajoules / kg.

Having said so much about the breeding of maggots, I believe everyone has a certain understanding of the breeding of maggots. The project of breeding maggots plays a high role in the agricultural industry, and the cost of raising maggots is low and the profit is high. For some aquaculture industries, breeding maggots is a high-return project.