After nearly two years of explosive development of crayfish farming, there are countless feed brands emerging in the market. How can we tell the quality of crayfish feed? How to choose a high-quality shrimp brand from the mixed feed brand is also a matter of great concern to us.
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First, the appearance:
Good feeds are generally finely pulverized. The regular large factories are superfinely pulverized, the mixture is very uniform, the particles are even and tidy, the granulation is well cooled, and there is no polarization. Inferior feed is difficult to ensure the quality of the feed due to the poor processing equipment, and there will be a lot of dust, resulting in a lot of feed waste.
Second, water resistance:
Generally good crayfish feed is required to be soaked in water for 6-12 hours without spreading to maintain the integrity of the feed during the night crayfish feeding. If the feed is quickly dispersed, the feed becomes powder or dissolved in water. Then, crayfish are hard to eat and pollute the water. But the kind of feed that doesn't scatter for a long time doesn't work either. It may be that the binder is over-added and the shrimp can't be digested and absorbed. Good feed nutrients will remain in the feed within 2 hours without spreading into the water.
Third, the smell:
The good shrimp has a pure smell, and the fish has a long-lasting flavor and a strong attracting taste. The shrimp loves to eat. Good feed should have the unique aroma of soybean meal, fish meal and soybean oil. The fishy taste is long and lasting, and there is no smell. The raw materials used in such feed are high quality raw materials.
Fourth, the breeding effect:
Good feed and poor feed will have obvious contrast effect after 15-20 days of use. The shrimps raised by good feed have large specifications, good color, full flesh, fast growth and strong vitality; poor feed shrimp grows slowly, specifications Not neat, and a small amount of meat.
Regular, professional, and good market reputation and after-sales service are important guarantees for quality product quality.
At present, the crayfish feed on the market is divided into two types according to the processing technology: one is the crayfish granule compound feed (also known as the manufacturer's cooked material), and the other is the dry puffed compound feed, referred to as the puffed material. So where is the difference between the two feeds? What is the difference between production process and product characteristics? Is it good to use small squid or granule feed?
The granular material production process is to pulverize, mix, temper, and ring mold extrusion granulation, cooling and air drying into finished products, and some manufacturers add secondary pulverization and tempering and ripening process to meet the product requirements of shrimp and crab material. The expanded material is a mixture of ultra-finely pulverized feed material in a high temperature, high pressure and high humidity environment with a temperature of 130-150 ° C in the extrusion chamber, continuously mixing, quenching, tempering, aging, and extruding the membrane pores. After the formation of a bulky porous feed product. Different processing techniques also result in different product characteristics of the finished product.
1. The water resistance is different. The processing temperature of the pellet feed cannot guarantee the complete maturity of the raw material due to the processing temperature. Therefore, it is necessary to add the binder to extend the water resistance. The puffing material has good water resistance due to different equipment processes, and it can be changed into a bulky state when it enters water for several hours, just like a sponge. The fluffy and porous feed structure of the expanded material is very suitable for mixing the pharmaceutical materials, ensuring that the drug is inhaled into the feed to fully achieve the therapeutic effect of the drug, and the feed is not dispersed due to the mixing of water.
2. The pulverization fineness and processing temperature of the expanded material, the degree of ripening of the product is different, and various pressures and mechanical effects during the expansion process can improve the gelatinization degree of the starch in the feed, destroy and soften the cell wall portion of the fiber, and denature the protein. Improve the stability of fat, improve the digestibility and utilization of feed. For crayfish, which are particularly short in the intestines, it is difficult to digest complex feeds. Puffed materials are more easily digested, absorbed and utilized, which can reduce excrement and have less water pollution.
3. The powder content is different, and the expanded material powder is less, which can reduce feed waste and avoid water pollution. Due to the special feeding method of shrimp, the dusty feed is also very unfavorable for feeding.
4. After the high temperature and high pressure puffing, the feed ingredients can completely kill the harmful bacteria and eliminate the anti-nutritional factors in the feed ingredients, thereby increasing the absorption and utilization rate of the feed and effectively reducing the intestinal diseases of the lobster.
5. Extruding material attracts food and has better palatability. The production process of bulking material determines that the bulking material is easy to add grease, and the fat penetrates from the inside of the particle to the surface, so that the feed has a special aroma, which is beneficial to increase the appetite of the farmed animal. Effectively avoid feed grade change, and will not affect the use effect due to uneven nutrients.
The crayfish feed production cost is different. Since the price of the sinking material production line is much higher than that of the pellet production line, the process cost of the expanded material is also 1-1.5 times the cost of the pellet material. Moreover, in the process of high temperature and high pressure, the water dispersion is very large, and the finished product of 1.1 tons of raw materials is only about 1 ton. Therefore, the moisture of the expanded material is generally much lower than that of the granular material, which is beneficial to the preservation of the feed, so the price of the expanded material is generally higher than a feed.