How to choose high-quality pellet feed

The size of the pellets should be uniform, the shape should be uniform, the surface should be basically smooth, the color should be uniform, and there should be no mildew, deterioration and odor. Measurement of powdering rate: The powdering rate refers to the percentage of the amount of powder produced during the storage and transportation of pellet feed and its total amount. It is required that the pulverization rate of the first grade product does not exceed 9%, and the pulverization rate of the second grade product does not exceed 14%. Determination of the durability index of pellet feed: Take 1kg pellet feed, select the specified standard sieve according to the particle diameter, and manually sieve the original sample. The particles on the sieve that fail to pass the sieve are used as samples. Take 200 g of the sample for durability. On the index tester, rotate the sample sieve at a speed of 50 r/min for 10 minutes, take out the sample, pass it through the specified sieve again, and weigh the sieve on the sieve. Determination of the hardness of pellet feed: The hardness of pellet feed not only affects the powdering rate and durability index, but also affects the palatability. The measurement principle is based on the compressive strength of pellet feed. Commonly used grain hardness tester and SYT-20 pellet feed hardness agent to determine. Determination of starch gelatinization degree in pellet feed: The starch gelatinization degree refers to the percentage of the ratio of the gelatinized starch in the starch to the total amount of starch. β-amylase can quantitatively convert starch into reducing sugars within a certain period of time under appropriate pH and temperature, and the amount of converted sugars is proportional to the degree of starch gelatinization. The degree of gelatinization of starch can be calculated by measuring the amount of reducing sugar by potassium ferricyanide method.