Fly maggot meal has a high crude protein content of 56% to 63% (average 59.5%), 13% fat, 7% ash and 3.1% sugar. As a high protein feed, the nutritional level of fly maggot is comparable to the best imported Peruvian fishmeal, 1.3 times that of soybean cake and 1.9 times that of bone meal. Fresh maggots contain 15% crude protein, 5.8% crude fat, not only can be directly served to feed conventional varieties of pigs, chickens, ducks, fish, but also special animals shrimp, crabs, eels, eels, American frogs, bullfrogs, seven-starred fish, zebra mussels, turtles and other best live bait.

Fly maggots are easy to cultivate, low cost, short cycle. 2000 grams of manure can produce 500 grams of fly maggots. 1 cubic meter fly cage can produce about 150 grams a day. With 10 fly cages with upper, middle and lower layers, you can get 20 to 25 kilograms of fresh maggots per day. The total cost of producing 1000 grams of fresh maggots is only 0.14 yuan. To 4 kg of fresh maggots equivalent to 1000 grams of fishmeal, only 30% of the price of fishmeal. According to Beijing Feed Research Institute test, in 18 square meters of breeding area, the average daily production of fly maggots 9.75 kg. The use of self-propagated fly maggot feed to feed chickens test, add 10% fly maggots in the feed, the control group feed add 10% fish meal, the results of the former than the latter's egg production rate increased by 20.3%, feed compensation increased by 15.8%. 100 grams of fly maggots fed piglets, than feeding the same amount of Peruvian fishmeal weight gain of 7%, cost reduction of 13.2%.

Guangxi Labor Reform Administration farm to achieve large-scale production of fly maggots after the average daily output of 300 kg of fresh maggots. Daily feeding of fresh masticated fish according to 5% of the body weight of the Egyptian Tangjiao, 10 days after the fish weight increased from 65 grams per tail to 175 grams, the rate of weight gain than the feeding of conventional feed for the control group to improve 41%. Maggot meal instead of an equal amount of fish meal formulated pig feed, the test group of pigs to increase weight gain by 5.1%, pig lean meat protein content increased by 5%; maggot meal instead of fish meal (equal amount) formulated chicken feed, feeding 1-month-old broiler chickens, the survival rate increased by 9%, weight gain increased by 20%, feed costs reduced by 7%, saving feed 20%-40%. Xingguo County, Jiangxi Province, port township Fenglin Village, a farmer, with bamboo gabions woven fly cages, cage flies developed to 14 cages, the daily output of fly maggots 30 kilograms, enough to 1000 snapper feed. Since the flies "woven into" the ecological chain, he raised snapper cost investment reduced by nearly half, while the annual output value than the original doubled. The basis of fly maggot utilization is the breeding of houseflies. The housefly has strong adaptability to the environment, strong fertility, and the technical cost and equipment investment of fly maggot breeding is relatively low. Technically, fly maggot breeding is no longer a difficult problem, whether it is the domestication of seed flies, optimization of growth conditions or food ratios and so on, there is a lot of research work, there are many research papers and books for reference, the Institute of Zoology of the Chinese Academy of Sciences and a number of other research units or colleges and universities have a group of experienced experts can be consulted. The key to good or bad fly maggot breeding lies in the selection of breeding flies and the mastery of the basic biological properties of houseflies. High-quality seed flies with high reproduction rate and survival rate, fast growth, high yield and no pathogenic bacteria are the important guarantee for factory farming. Fly maggot industry personnel should draw on the existing research results based on the appropriate adjustments according to the environmental conditions and resources of each place.

The breeding of houseflies itself requires investment, whether it can bring considerable economic value. Depends on the cost and scale of production, market demand and the level of exploitation. Therefore, the economic benefits of fly maggot culture and utilization can not be generalized. The high cost of culture is a limiting factor for the development of fly maggot industry, and how to reduce the cost of culture is a key issue to be considered. Under the condition of meeting the basic physical environment (temperature, humidity, light and aeration), we can boldly try to use the local cheap waste materials (such as wine lees, soya bean dregs, scraps of livestock and aquatic products processing, and even dung of livestock and other almost all organic waste materials) or change the ratio of optimizing the composition of food materials according to the characteristics of the local resources, to achieve the purpose of improving the production of fly sisters and reducing the cost of fly maggot farming. Factory, automation, scale can improve the production efficiency, reduce the use of labor, can undoubtedly reduce the cost of farming, but the scale of fly maggot farming with the development of the market as well as the degree of proficiency of the breeding technology and gradually expand. Farming enterprises can fully explore the utilization value of fly maggots and comprehensively recycle the breeding waste to achieve optimal economic benefits. Protein is the constituent material of life, and the shortage of protein resources is one of the four major crises in the world today. Statistics show that about 2/3 of the world's population lacks protein. China's protein consumption level is even lower, only half of the developed countries, and slightly lower than the average level of third world countries. Especially in the trend of rapid population growth, the search for new resources of protein to supplement the future food shortage, has become an urgent task in front of us; with the rapid development of aquaculture, with the rise of the feed industry, so that the supply and demand for fishmeal is becoming increasingly tense, especially in our country, is vigorously developing the aquaculture industry, the feed needs of the large amount of animal protein feed supply has become an important constraint on the development of the industry.

, fishmeal is the main animal feed protein source, is the pillar of the feed industry. About 1/3 of the world's fish production (80 million tons) is processed into fishmeal, the total output is 5 million tons. China's fishmeal production started in the 1950s, mainly concentrated in Zhejiang, Guangdong, Fujian and Shanghai coastal areas. The main raw materials are marine capture of aquatic processing waste and scraps, as well as low-value fish and shrimp. However, the processing technology is backward, poor quality, raw materials in short supply, the number is very small; especially due to indiscriminate fishing, offshore resources have been seriously damaged, intensified juvenile; on the other hand, the vigorous development of the aquaculture industry, stimulating the feed protein source, the need for fishmeal increased, making China's supply and demand for fishmeal increasingly acute contradiction between supply and demand, supply shortages, which directly caused the price of the steep rise, and the eye of the adulteration phenomenon is serious. At present, countries around the world are having research and development and utilization of new feed protein resources. In order to solve the problem of fishmeal shortage, China must also strive to improve the quality of domestic fishmeal and fishmeal substitutes for the development of research.

Animal protein feed resources are mainly dependent on animal production, so the effective way to solve this problem should still start from the development of animal resources. The development of a new biological resources, must have pollution-free, high production potential, high protein content, easy to produce, low-cost, high-efficiency and other prerequisites, to have the feasibility. To completely replace fishmeal, only animal bait or its processed products.

A large number of nutritional studies have proved that insects are rich in protein, less fiber, rich in trace elements, easy to absorb. Especially rich in essential amino acids. The fat contained in the soft fat and unsaturated fatty acids, digestive performance is good, is better than meat and eggs of the largest animal protein resources, development potential is huge. Since insects are easy to feed and manage, and have the characteristics of efficiently converting food into weight (the conversion rate can be as high as 30%, which is four times higher than that of grazing sheep), the development and utilization of this natural resource should attract enough attention. In addition, due to the high protein content of insects, it is easy to extract high-purity high-quality proteins, which not only expands the scope of application in the aquaculture industry, but also expands the scope of application in the food and pharmaceutical industries. Insects have the most development value and can form a large-scale production of silkworm pupa powder, fly maggot powder and so on. Fly maggot powder has a crude protein content of 63% in its dry powder, which is rich in essential amino acids. It is a new high-quality high-protein feed, and can be produced using livestock and poultry manure waste, low cost. Domestic and foreign large-scale factory production.