Effect of Feed Formulation on PDI (Particle Feed Durability Index PDI)

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The formulation is a combination of various raw materials, which is the main factor affecting the durability of the particulate feed durability. Studies have shown that the proportion of formulations in various influencing factors is around 40% (Liu Pein, 2003). The contribution rate of the various raw materials in the formula is different, depending on the difference between the contribution rate of PDI, Boerner (1992) gives different particulate mass coefficients (PQF) according to different raw materials. See Table 1), the larger the particle mass coefficient, the more the particles produced, the higher the PDI, the lower it. As the bentonite, lignin in Table 1, the pqf is higher, generally used as a binder; another as acidic oil, PQF is -40, indicating that the more oil feedstock components, the more loosened the particles, The lower the PDI of the particles. A reasonable formula must consider the nutritional needs and consider making the quality of the particles. The particulate mass coefficient of the feed formulation recommended by Boerner (1992) should be at least 4.7. 8JX China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry

Different nutrients and contents and sources have different effects on PDI. Starch is one of the main nutrients in the feed. Generally, the glyph is not easily granulated, and the produced particles are loose, but if it is passed through water, the granulation performance is greatly improved, and the surface of the particles is smooth. After cooling, the particles are combined with a tightly, and the PDI of the particles is higher. Different sources of starch have different effects on PDI. Generally, the starch of wheat and wheat is better than corn and sorghum granulation, because the structure of the starch is different. The protein is also the main nutrient component in the feed, natural protein has good plasticity under hydrothermal action, the particles prepared are closely fit, the PDI is high, but if the protein content in the formulation is too high, it affects the absorption of steam, Granular performance drops. In addition, if the formulation is an additional non-protein egg (such as urea), the quality of the produced particles can be affected. For fiber components in the feed, the fibers generally (3% to 5%) of the fibers are advantageous for the quality of the particles. Due to the mutual impairment of the fibers, the hardness of the particles produced is high, not easy to break, but there are many fibers in the formula. Since it itself has elastic and water-absorbing expansion, the obtained particles are prone to cracks, which is easily broken to produce fine powder. The fat component in the formulation, if it is the fat containing the raw material itself, such as soybean meal, etc., the PDI of the particles is small, and it is advantageous for granulation, which can reduce the wear of the mold. If it is an additional fat, the PDI of the particles has a large influence, and the particles produced are loose, and the fine powder is more. Generally, the additional fat should not exceed 3%, and then need to be added.

8JX China Feed Industry Information Network – Based on Feed, Service Animal Husbandry

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