Farming Knowleagde

Extruded feed refers to the feed produced by extrusion process. The extrusion process is to place the powdery feed in the conditioner of the fish feed extruder. In the high temperature, high pressure and high humidity environment, after being squeezed by the screw extrusion device, the temperature and pressure of the material increase continuously. After a certain temperature and pressure, it is suddenly released from the material die hole to normal temperature and pressure, and is cut into the desired shape and length by the cutter.

In addition to the general advantages of pellet feed, extruded feed has the following advantages:
(1) Higher digestibility Raw materials undergo high temperature, high pressure treatment and various mechanical actions in the puffing process, which can destroy and soften the cell wall part of the fibrous structure, making starch gelatinized and protein organized, which is conducive to animal digestion and absorption. Feed The digestibility and utilization rate of fish are significantly improved. For example, fish extruded material can increase the digestibility by 10% to 35%. Some young animals, such as suckling pigs or piglets, calves, etc., are difficult to digest complex plant feeds due to their underdeveloped digestive organs. Extrusion can effectively improve the digestibility and utilization rate of feeds.
(2) The template of the extruder with various shapes can be made into different shapes of die holes, so extruded pellets of different shapes can be extruded. For example, cat feed can be made into fish shape, dog feed can be made into ribs, etc., which greatly improves the appearance and attracting value of feed.
(3) The more hygienic puffing process enables the material to undergo a higher temperature and pressure treatment than the granulation process, so a better sterilization effect can be achieved. It can not only prevent animal digestive tract diseases, but also more effectively remove heat-sensitive toxins and anti-nutritional factors from feed.
(4) Better palatability In the process of puffing, not only starch ripening can increase the aroma, but the fat penetrates from the inside of the cell to the surface and the interaction between sugar, protein and fat also makes the feed have a special aroma. All of these make the feed more palatable and help stimulate the animals to eat.
(5) Improve the sedimentation performance of the feed in water. By setting the parameters of the extruding process, extruded feed with various sedimentation speeds, such as buoyancy, slow sinking and sinking, can be made to meet the requirements of different living habits of aquatic animals. Reduce feed loss and avoid water pollution. For example, loose, porous, floating feeds are suitable for pelagic fish.

Due to the special use effect of extruded feed, it is mostly used in the production of pet feed, aquatic feed and suckling pig feed. In use, it should be noted that extrusion and puffing have a certain destructive effect on vitamins and amino acids, and have large power consumption, low output and high cost, but they can generally be compensated from the increased feed remuneration.