A Detailed Explanation of the Technical Method for Raising Fly Larvae with Wheat Bran
Now the agricultural industry is developing faster and faster, with supply falling short of demand. In order to discover the agricultural industry faster and better, the industry of raising fly larvae has begun to emerge. Raising fly larvae has very successfully advanced the development of the agricultural industry, and has also improved the quality of the agricultural industry. Below we will talk about the technology for raising fly larvae.
Technology for Raising Fly Larvae with Wheat Bran
It is recommended to add a certain amount of straw and manure when fermenting wheat bran. This can reduce costs to a certain extent and avoid the large amount of sour odor produced when wheat bran is fermented alone.
1. Pig manure fermentation. Generally, 1 kg of Rujin pig manure fermentation agent can ferment 1.5 tons of pig manure (about 3 tons of fresh manure). The fermentation agent needs to be mixed and diluted with rice bran (or cornmeal, wheat bran) at a ratio of 1:5, then evenly sprinkled into the pig manure material pile and mixed evenly. Adjust the moisture of the fermentation material to between 60~65%. Method for judging: tightly grab a handful of the material; water marks are seen between the fingers but no water drips, and it is suitable if it falls apart upon hitting the ground. Pile up the pig manure mixed with Rujin pig manure fermentation agent; it should not be too small (a height of 1.2~1.5 m is suitable, width 2 m, length 2~4 m). During fermentation, pay attention to turning it over 2~3 times and control the temperature at around 65 degrees. Generally, fermentation can be completed within one week.
2. Egg collection. Send the fermented pig manure into the larvae room and pile it into long strips 0.8 m long, 0.2 m wide, and 0.15 m high. Place egg-collecting material on the manure piles, with three small piles placed on each strip. The formula for the egg-collecting material is: calculated based on 100 kg of manure material: 1 kg of wheat bran, 2 liang of fish meal, 3 liang of peanut bran, 1.5 kg of water. After mixing evenly, it can be placed on the manure pile. After placing the egg-collecting material, it is forbidden to walk around in the larvae room.
3. Collecting larvae. At room temperature of 25~35°C, egg masses generally hatch into small larvae after 8 hours. During the fermentation process, the functional probiotics contained in the Rujin bacterial pig manure fermentation agent have the effect of inhibiting the growth of harmful bacteria; moreover, the high temperature produced by fermentation can kill parasites and pathogenic bacteria that cannot tolerate high temperatures, creating a healthy environment for the hatching and growth of young larvae. The small larvae will first eat the egg-collecting material, then burrow into the manure pile to grow. The fermented pig manure has balanced nutrition, and the nutrients are more easily digested and absorbed by the larvae, which can ensure the nutritional needs for rapid growth. Within 72~96 hours after hatching is the peak period for crawling out, and collection can be carried out. Generally, on the 4th day after putting in the manure, the larvae in the manure pile can basically finish crawling out and be collected.
How many jin of bran produce one jin of fly larvae?
For 100 kg of wheat bran, the total crude protein is 15 kg, and the crude fiber of wheat bran is 9.5%, which means that at least more than 9.5% of the wheat bran cannot be recovered as fly larvae. Of the 15 kg of crude protein, recovering 70% is already the highest possible, so it is estimated that only about 10 kg of protein can be recovered (the wheat bran after raising fly larvae will definitely still contain quite a lot of protein). The crude protein of dried fly larvae is generally around 65%, so by calculation about 16 kg of dried fly larvae can be produced. Assuming every 4 kg of fresh fly larvae is dried into 1 kg of dried fly larvae, the maximum production of fresh fly larvae can be 64 kg. This is almost the highest yield.
Why Raise Fly Larvae
An important part of ecological agriculture. Incorporating fly larvae breeding into the material recycling of ecological agriculture can successfully solve the two major problems troubling livestock and poultry production: manure pollution and feed shortage. Livestock and poultry digest and absorb only 60% of feed nutrients, and the rest is lost in the manure. Livestock and poultry manure is rich in nutrients such as protein. Fly larvae can digest and absorb almost all of the nutrients lost in the manure and convert them into insect protein. Other insects are unable to take on this task, but fly larvae can shoulder this heavy responsibility. In addition to farming and planting, adding insect breeding extends the food chain, enabling material energy to transform into a higher quality and become a substance usable by higher animals, improving resource utilization.
Problems Existing in Raising Fly Larvae with Wheat Bran
The first obstacle is that wheat bran easily turns sour. This is a difficult problem encountered by many people. Wheat bran mixed yesterday afternoon was found to have an obvious sour smell this morning, and the fly larvae then stopped eating it. This is because fly larvae require food with a pH value of 6.2~8, and food below 6.2 will be refused. If wheat bran is fermented with EM, etc., or directly mixed into feed, a problem will arise: EM is a microorganism, and microorganisms will lower the pH value of the material during fermentation. Even if it is not fermented and directly mixed into the material, an excessive amount will cause the wheat bran to acidify faster. As mentioned earlier, wheat bran naturally lowers its pH value after adding water. Why are there fewer problems in high-temperature seasons, while problems arise when the temperature is below 25°? This is because when the temperature drops, the time for seed flies to lay egg masses is prolonged. For example, when the ambient temperature is 22~25°, it takes 36~24 hours to hatch. At this time, the wheat bran is already acidifying. After hatching, the fly larvae have no appetite for the wheat bran, or begin to have a little appetite, but as time goes on, the wheat bran becomes more and more sour, so the fly larvae eat only a small amount of wheat bran or do not eat the wheat bran at all. Why do animal manures not have this acidification problem? Because the pH value of animal manure is generally 7.5~8, and even if microbial fermentation is used, it will not drop below 6.5.
The second obstacle is the crude fiber in wheat bran. Earlier we learned that the crude fiber in wheat bran is 9.5%, and we also learned that fly larvae have no teeth and rely on absorbing nutrients, so fly larvae are helpless against crude fiber food. In suitable high-temperature seasons (33~35° is optimal), tests showed that when we placed 40 g, 50 g, and 60 g of egg masses respectively into 5 kg of wheat bran, the weight of fly larvae harvested and the weight of wheat bran residue were basically the same, only the individual size of the fly larvae differed (the more egg masses, the smaller the individual fly larvae). This shows that fly larvae can only use so much nutrition from wheat bran and are helpless against 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 around 15%. After raising fly larvae and harvesting, the total crude protein of the fly larvae is generally within the total crude protein of the material you input. It can be calculated: for example, input 100 kg of wheat bran, the total crude protein is 15 kg, and the crude fiber of wheat bran is 9.5%, which means that at least more than 9.5% of the wheat bran cannot be recovered as fly larvae. Of the 15 kg of crude protein, recovering 70% is already the highest possible, so it is estimated that only about 10 kg of protein can be recovered (the wheat bran after raising fly larvae will definitely still contain quite a lot of protein). The crude protein of dried fly larvae is generally around 65%, so by calculation about 16 kg of dried fly larvae can be produced. Assuming every 4 kg of fresh fly larvae is dried into 1 kg of dried fly larvae, the maximum production of fresh fly larvae can be 64 kg. This is almost the highest yield. Those who say 1 kg of wheat bran produces 1 kg of fly larvae are simply talking nonsense (this violates the law of conservation of matter). In addition, the energy of wheat bran is very low. Its digestible energy is only about 9 megajoules/kg, and its metabolizable energy content is about 7 megajoules/kg. Also, because wheat bran lacks starch-type substances, it affects the synthesis of glucose; by comparison, the metabolizable energy content of corn is 12.9~14.5 megajoules/kg.
Having said so much about matters concerning raising fly larvae, I believe everyone has gained a certain understanding of raising fly larvae. The project of raising fly larvae has played a very strong role in the agricultural industry, and raising fly larvae has low cost and high profit. For some breeding industries, raising fly larvae is a high-return project.