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How to Identify Adulterated Pig Feed? A Few Practical Methods to Teach You

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(1) Observe with your eyes. Buy 1 magnifying glass, with a higher magnification. Sift the feed with a sieve, spread it into a thin 1 layer, and carefully observe the material on the sieve and below the sieve with the magnifying glass. The characteristics of some of these materials under the magnifying glass are as follows. 1. Fishmeal The main components of fishmeal are fish meat, fish bones, fish spines, fish scales, fish eyes, etc., and no other substances should be present. Under the magnifying glass are fish scales and fish eyes; the fish scales are covered with concentric circles, the fish bones from the head are flaky, the fish spines are tetrahedral, and the fish meat is composed of muscle fibers. 2. Blood meal The edges of the particles are sharp and reddish-brown; the black shell fragments are usually tightly curled, with a smooth surface and marks like needle pricks. Hard seed hilums can also be seen, oblong, yellow, brown, or black. 3. Rapeseed cake (meal) The rapeseed meal shell is brown or black, with a meat-like texture on the surface. 4. Cottonseed cake (meal) The cotton shell has two layers and does not separate; the outer layer is dark and the inner layer is light, and the outer shell is connected to the cotton lint; there are many fine hairs, appearing silvery under the lens. 5. @#@245@#@ Bran is mainly the outer skin of wheat; the bran flakes are flaky and contain many starch granules. 6. Bone meal is bone fragments, opaque, white, lusterless, with a rough surface and hard texture. 7. Shell meal is a white or gray powder, and some shells still have faint lines.

(1) Observe with your eyes

Buy 1 magnifying glass, with a higher magnification. Sift the feed with a sieve, spread it into a thin 1 layer, and carefully observe the material on the sieve and below the sieve with the magnifying glass. The characteristics of some of these materials under the magnifying glass are as follows.

1. Fishmeal The main components of fishmeal are fish meat, fish bones, fish spines, fish scales, fish eyes, etc., and no other substances should be present. Under the magnifying glass are fish scales and fish eyes; the fish scales are covered with concentric circles, the fish bones from the head are flaky, the fish spines are tetrahedral, and the fish meat is composed of muscle fibers. 2. Blood meal The edges of the particles are sharp and reddish-brown; the black shell fragments are usually tightly curled, with a smooth surface and marks like needle pricks. Hard seed hilums can also be seen, oblong, yellow, brown, or black. 3. Rapeseed cake (meal) The rapeseed meal shell is brown or black, with a meat-like texture on the surface. 4. Cottonseed cake (meal) The cotton shell has two layers and does not separate; the outer layer is dark and the inner layer is light, and the outer shell is connected to the cotton lint; there are many fine hairs, appearing silvery under the lens. 5. @#@245@#@ Bran is mainly the outer skin of wheat; the bran flakes are flaky and contain many starch granules. 6. Bone meal is bone fragments, opaque, white, lusterless, with a rough surface and hard texture. 7. Shell meal is a white or gray powder, and some shells still have faint lines.

(2) Identify by the reaction of iodine with starch

Buy 1 bottle of medical iodine tincture. Take a little of the raw material, such as soybean cake or other oilseed cakes or meals, place it in a clean white porcelain dish, spread it thin and flat, then drip a few drops of iodine tincture on it, and observe after 1 minute. If some of the material turns blue-black, it indicates adulteration; the more material that changes color, the more adulteration there is. This is because legume cakes and meals do not contain starch, and only starch turns blue when it meets iodine. Common adulterants in soybean meal are rice, bran, and rice husks, etc.

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