来源：http://www.liuhecha.com/ 日期：2020-04-24 发布人：admin
The basic method of pig feed recognition: smell, touch, look and taste.
Smell: certain feedstuff materials have their own fragrant smell. If they have peculiar smell, peculiar smell, moldy taste or tasteless (adulteration can cover up fragrant smell), it means that feedstuffs are fake and inferior materials.
Touch: because the human body is equipped with bioelectricity, it can be repeatedly inserted into the feed material by hand, and then extracted to shake off. If the small matter is not easy to shake off, it means there is a fake.
See: ① whether the color is consistent. The specific feed material has its inherent luster. If there are substances with different colors and glossiness in the same batch of raw materials, it means there is a fake; ② whether the particle size is neat. To see if there are more orderly small particles or ultrafine materials in the raw materials with smaller particle size, and there are a certain number of them. If there is a comparison between its destruction and specific raw materials, one can know.
Taste: specific raw materials have a fixed taste, such as sweet, sour, astringent, bitter, fragrant, etc. if you often taste them, you will know that they are different; especially when you taste stone powder, zeolite, sandstone, etc.
Identification method of adulteration of some common feed materials
Soybean meal dealers often mix large pieces of bran, rice husk, rice bran and ground loess corn (2316, - 9.00, - 0.39%) flour to make small particles, and then color them to make "soybean meal material". There are also those that only use ground loess to make grains and color them, which are mixed in soybean meal, resulting in the crude egg white content of soybean meal falling below 30%.
① Smell, the soybean meal mixed with "soybean meal material" changes from strong fragrance to light fragrance or no fragrance at all.
② It can be seen that the color of soybean meal is light yellow, the deep yellow with high heating temperature, and the luster without adulteration is very obvious and uniform, while the overall glossiness of soybean meal mixed with "soybean meal material" is reduced, especially the "soybean meal material" basically has no glossiness; After taking away the larger ones, the smaller ones will be left. Then, pinch them with the index finger and thumb of the right hand, and rub them hard. It will be known that the soybean meal, even the smallest ones, can not be rubbed with two fingers.
(3) taste, real soybean meal has bean flavor, and adulterated insipid (corn flour, stone powder, etc.) or earthy flavor (mixed with loess, silt, etc.).
④ Soak in water, put a proper amount of sample into a large glass, soak in water for 2 hours, and then stir gently with a small stick. If there is stratification, the upper layer is soybean meal, the middle layer is corn flour (cake), the lower layer is loess, calcium powder, stone powder, etc.
⑤ Drip iodine, take a small amount of sample and put it in the slide, drip a few drops of iodine on the sample, if any substance turns blue black after 1 minute, it is proved that there is corn, bran, rice skin, etc.