I. Basic Methods of feed identification: smell, touch, look, taste
Smell: specific feed ingredients have its unique aroma, such as smell, smell, taste or smell of mildew (adulteration can mask fragrance) that feed for counterfeit materials.
Touch: because the human body with bioelectricity, hand repeated insertion of feed raw materials, and then taking off, if the fine material is not easy to shake, it is false.
See: the color is consistent. Specific feed material has its inherent luster, if the same batch of raw materials have different colors and gloss of different substances, indicating that there is a false. See if the smaller size of the raw materials have more neat small particles, or whether there is ultrafine substances, and a certain amount. If there can be damage and special material to do comparison, a glance.
Taste: specific raw materials have fixed the taste, such as sweet, sour, astringent, bitter, sweet, if often taste, will know different; especially powder, zeolite powder and a taste of it.
The two part, recognition method common feedstuff adulteration
, 1 soybean meal
The corn flour mixed commonly used large bran, rice husk dealers and rice bran and milled into fine particles, and a color made "meal", also has a single colored ground of loess granulation, mixed with soybean meal, the crude protein content of soybean meal fell below 30%.
Recognition:
The smell, with "meal" meal by Luzhou into a faint fragrance or no fragrance.
II, meal light yellow color and high heating temperature of the deep yellow, not adulterated gloss is very clear, uniform, and mixed with the "meal" meal the whole gloss reduced, especially the "meal" basically no gloss; the size of neat, too large removed, remaining small, and then with the right hand forefinger and thumb pinch, rub hard, at a glance, a real meal, even small particles, with two fingers rub is not thin.
The taste, really have soybean bean flavor, and adulterated tasteless (corn, powder) or earthy (mixed with loess and silt).
The flooding, take appropriate amount of sample into a large glass, 2 hours of water soaking, and then use a little stir gently if the stratification, the upper middle soybean meal, corn (cake), lower for loess, calcium powder, powder etc..
5 drops of iodine with, take a small amount of sample is placed on a slide, a few drops of iodine in the sample, after 1 minutes if the material becomes blue black, that mixed with corn, wheat bran, rice and other skin.
, 2 cottonseed meal
Mainly mixed with clay, bentonite, zeolite powder or brown sand powder, calcium powder, are also useful for colored soil, wheat bran and rice bran, rice husk processed into the "meal".
Recognition:
Cottonseed meal because of different origin, the process is not the same, leading to the production of color and quality of cottonseed meal is different, should according to the specific conditions, check with water immersion method was used to identify more easily made sense, is also more accurate.
, 3 fish meal
Often mixed with feather meal, blood meal, leather powder, corn protein powder, wheat powder, fish oil, bone, shell powder, urea, ammonium salt.
Recognition:
The smell, good quality fish meal had light fish flavor, no fishy smell, or pungent odor of ammonia.
II, with the origin (Peru, Japan, Russia, China Offshore) and fish (Peru, Japan, Russia Nobel sardine sardine whitefish, China Sea fish) and processing technology is different, but the color and luster is the same, the particle size is the same, you can see a lot of loose fish a small amount of muscle fiber, fisheye, fishbone, scale.
The taste, good meal mouth tasting a fish smell no smell, easy to mouth containing, and no chemical adulteration.
The water, take a small amount of fish meal into water glass, with a little stir gently, good quality fish meal quickly into the bottom of the cup, the water is clear, no floating, but the quality of time or the adulteration after mixing water turbidity, precipitate slowly, with floats. More varieties and large quantities of adulteration can be reflected in different levels.
The odor detection, the amount of the sample in the sealed container can be heated in (preferably with a conical flask with a cover) after 15 minutes of heating, open the cover, such as the smell of ammonia odor, indicating mixed with urea.
4, bran
Often mixed with rice bran, peanut bran, sawdust, talcum powder, calcium powder etc..
Recognition:
Gently tapping with good bran packaging, if there is a small white powder that pop up, mixed with talc or calcium powder; inserted by hand in the bran, then pull out, if the hands are white powder, easy to shake off is not easy to shake off the remaining flour, talcum powder, calcium powder is used; the hand picked up a bran rub hard, if incorporated, is pure bran, if the hand up feeling, is suspected to have rice husk, sawdust, peanut bran.