At present, the outstanding problems in the feed industry, except that the heavy metal content of some feed ingredients often do not meet the hygiene standards, it is mainly artificial addition of inorganic salts such as copper, iron, zinc and other elements. High-dose copper (125-250mg/kg) in pig feed not only has a growth-promoting effect, but also makes the pig's skin red, the feces black, and improves the commercial performance of the feed, enabling the farmer to color the pig skin and feces one-sidedly. As a key indicator to measure feed quality. To cater for this psychological demand of farmers, feed companies are continuously increasing the amount of copper added. The amount of copper in some feed products has reached or exceeded the minimum toxic dose of pigs. When pigs were supplemented with 100-125mgA/kg copper, pig liver copper increased 23-fold; when added 250mg/kg, it increased 10-fold; when added to 500mg/kg, liver copper level could reach 1500mg/kg. Excessive hepatic copper can affect liver function and reduce Hb content and hematocrit value. After people eat this kind of liver, there will be hemoglobin reduction and jaundice and other poisoning symptoms. With the increase in the amount of copper added, the amount of zinc, iron and other elements added accordingly. In recent years, many companies have added zinc oxide 2000-3000mg/kg to piglets to prevent diarrhea in piglets. The use of high-zinc, high-iron also produces similar copper residues and poisoning symptoms.
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