Feed quality control should pay attention to matters

1. The raw material samples to be tested should be representative. Therefore, it is recommended that the sampling points of each batch of raw materials be as many as possible, and the number of samples should be as much as possible (because adulteration is not only present in the same bag of raw materials, but also in different bag raw materials). I experienced: in a batch of flour, the package around the car is qualified flour, the middle part is a non-conforming product with 50% bran; in a batch of calcium hydrogen phosphate, more than 10 packets of color are gray, the calcium content is high. Insufficient phosphorus content is suspected to be a non-conforming product of stone powder. Bhc China Feed Industry Information Network - based on feed, serving livestock

2, when the raw material microscopy, often just a simple look, and did not do the appropriate treatment. It is recommended to combine some treatment methods before microscopy to detect more adulterants. Specific practices are: bhc China Feed Industry Information Network - based on feed, serving animal husbandry

(1) Screening: The sample is sieved by standard sieves of different size holes, and samples of different sizes can be screened for targeted microscopic examination. Bhc China Feed Industry Information Network - based on feed, serving livestock

(2) Carbon tetrachloride treatment: Samples with high oil content or a large amount of particles adhered to it can be treated with carbon tetrachloride solution (fish meal, meat and bone meal and most poultry feed and unknown feed are best used in this method). This allows the use of different density principles to separate light-weight floats (generally adulterated in floating objects) and heavy-density materials. Bhc China Feed Industry Information Network - based on feed, serving livestock

(3), acetone treatment: the use of acetone to dissolve organic matter and dehydration properties, used to treat the formation of agglomerate structure caused by molasses or high moisture, the sample can be more clearly observed. Bhc China Feed Industry Information Network - based on feed, serving livestock

For the suspected samples of microscopic examination, I do not know how to use some simple chemical reactions to qualitative analysis (such as dilute hydrochloric acid method, iodine-potassium iodide staining, phloroglucin staining, etc.), but blindly determine. Bhc China Feed Industry Information Network - based on feed, serving livestock

3, over-reliance on laboratory testing indicators, not sensitive to sensory testing. Some raw materials can only distinguish between true and false by sensory inspection. It is not necessary to send them to the test (such as a lot of bran in the flour, sour and sour in the soybean meal), and it is a taboo for quality control without thinking about mechanically. Bhc China Feed Industry Information Network - based on feed, serving animal husbandry

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