The price of raw materials such as peanut meal, rapeseed meal, cottonseed meal, sub-powder, wheat bran, and rice bran is not high due to low price, and there is less artificial adulteration, mainly paying attention to their own quality problems such as purity, freshness and moisture content.
The feed value of peanut meal is second only to soybean meal. Protein and energy are high, but the composition and proportion of amino acids are not appropriate. Normal peanut pods are fresh yellow-brown or light brown, with the smell of cooked peanuts, good palatability. Water should be controlled below 12%.
Both rapeseed meal and cottonseed meal are relatively inexpensive high-protein raw materials, but due to their own toxicity, the amount is controlled. The normal rapeseed meal is yellow-brown, reddish-brown, gray-black shards, crushed or coarse powder, and has round, reddish brown, grayish black, or dark-yellow colza, crispy, fragile, and non-glossy. Bitter taste. Generally the redder the appearance, the lower the protein content. Water should be controlled below 12%.
Cottonseed meal is usually light brown, dark brown or black, powdery or small group, visible cotton, visible under the microscope on cotton shell debris translucent, white shiny fiber. The main concern is the content of lint, and the more the content, the worse the quality.
Sub-powder is a by-product of wheat flour milling. It is light white to brown fine powder, and its moisture content should not exceed 13%. Some aquafeeds require secondary granules to have a certain degree of gluten, and additional gluten testing is required.
Wheat bran is rich in vitamins. The normal wheat bran should be light yellow to reddish gray. The color is fresh and consistent, finely crumb-like, and the bran should not be too large, otherwise the quality will decline. It has unique odor of crushed wheat, no fermentation, mildew, agglomeration and odor. Crude fat is lower than rice bran, so the storage period can be longer than rice bran, but it should not exceed one month.
Rice bran is a light yellow or brown powder or coarse powder, slightly oily, containing a small amount of broken rice, coarse glutinous rice, and unique flavor of rice bran, which should not have a bad smell. No insects and agglomeration, rough can not be too much, or poor quality.
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