In China, relevant organizations have drawn up the standards to make shrimp feeds, including the physical and chemical indexes. How to evaluate the shrimp feeds from physical indexes? They require the shrimp feeds should be featured in the black and even color, smooth surface, good curing degree, even size, orderly cut, even length, no deterioration, mildew, caking and off-flavor.
Before being pelletized into feeds, powered materials should be 80 mesh higher. The water-tolerant time of feeds should be more than 2 hours. As to the mixing uniformity, it should be larger than 95%. Then, how to judge the shrimp feeds from chemical indexes? Their water content should be smaller than 11%. Their PH value should range from 5.0 to 8.5. Content of gross protein should be higher than 38%.
Content of crude fat should range from 3% to 8%. Content of coarse fiber should be smaller than 5%. Crude ash should be less than 16%. Sawdust pellet mill is one of the key equipment to make shrimp feeds, since it decides many physical indexes. Therefore, it is quite important to select the well-designed sawdust pellet mill.
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