What is the difference between extruded feed and expansive feed?

There are the following differences between extruded feed and expansive feed:

1.Extruded feed is a kind of feed that expands the volume of materials through processes such as quenching and tempering, pressurized extrusion and sudden depressurization. This processing process needs to carry out the feed pellets under the conditions of high temperature, high pressure and high shear, therefore, the extruded feed is suitable for the production of extruded pellet feed.

2.The expansive feed is treated by high temperature and high pressure, but not compressed and molded, so as to obtain powdered materials or irregular particles with different expansion rates.

3.In the production process of extruded feed, due to the processing conditions of high temperature and high pressure, most of the pathogenic microorganisms can be killed, while the extruded feed does not have this sterilization effect.

4.In addition, according to the different processing temperature and pressure, there are also differences between extruded feed and expansive feed in terms of appearance, density, moisture and nutrient content.

In summary, there are differences between extruded feed and expansive feed in terms of production process, appearance, density, moisture and nutrient content. You can choose different feed types according to your actual needs.

Both of them are to carry out high temperature, high pressure and high shear of materials, but the difference is that the temperature and pressure of the two are different. The temperature and pressure of expansion are higher than that of expansion, and the temperature of expansion generally does not exceed 135 degrees Celsius, while the expansion can reach 120---180 degrees.

It's not a difference, it's just a different name.

Extrusion is similar to expansion processing, with the following differences:

Pellets are required for extrusion processing. The expansion process is made into powdered materials or irregular particles with different expansion rates.

Extrusion processing is suitable for the production of extruded pellets, while expansion processing is used for raw material pretreatment.

Extrusion refers to the fact that the feed is tempered, pressurized, extruded and suddenly depressurized, so that its volume expands and makes it a fluffy pellet feed. Expansion is the feed through quenching, pressurization, extrusion and sudden pressure reduction, so that its volume expands, into fluffy regular pellets. After the feed is expanded or extruded and pelletized, the digestibility is significantly improved.

It has been reported that the digestibility of feed can be increased by 5% to 15% in pigs and 2% in soybean meal after extruded grains. Fish feed digestibility can be increased by 10% to 35%. Some low nutritional value raw materials, after extrusion or expansion processing, significantly improve the digestibility, and then make full use of feed resources and reduce the cost of formulation.

After the feed was extruded or expanded, the palatability was significantly improved, and the feed intake was significantly increased. Anti-nutritional factors that are sensitive to damp heat in the feed are destroyed by extrusion or expansion, thus improving animal performance. For example:

Soybean is expanded and processed into full-fat extruded soybean flour, which is widely used in the production of compound feed for piglets, broilers, foxes and leopards, and is made into loose and porous floating pellet feed, which is suitable for upper fish feeding. Feed waste and water pollution are avoided. After the feed is puffed or expanded, it kills the diseased microorganisms and reduces the incidence of animal digestive tract diseases.

Extruded feed is an extruded porous feed obtained by a high temperature and high pressure extruder and then suddenly depressurized. Pellet feed is generally pellet feed extruded by the compression roller of the pellet mill, which is generally cylindrical in shape. Extruded feed and pellet feed can be used as fish feed, extruded feed is better due to good palatability, high digestibility and other reasons, but it is much more expensive.

Pellet feed can be used for general freshwater fish, and puffed feed is used for special high-grade fish.

Compared with ordinary full-price pellet feed, extruded feed has its own unique advantages: firstThe palatability of the feed is improved. Second, it can also improve the quality of the feed, of course, because the protein is combined with the starch matrix, so it is not easy to lose during feeding.

The extruded feed is fluffier and more digestible.