High copper (up to 250 ppm) is a growth promoter widely used in production. However, high copper has an adverse effect on the quality of pork, which makes the body fat soft. Due to the increase of unsaturated fatty acid content and muscle copper content, the degree of oxidation of lipids increases, and it is easy to produce stale taste. However, since copper is also a cofactor for superoxide dismutase, it constitutes the first line of defense of the body's antioxidant system and plays an important role in preventing free radicals. Therefore, it is best to use an appropriate amount of organic copper in the diet. 5z5 China Feed Industry Information Network - based on feed, serving animal husbandry

Iron is an important component of hemoglobin and myoglobin, which plays a decisive role in the formation of flesh color. At the same time, it is also a cofactor of the body's antioxidant system catalase, which plays an important role in preventing lipid oxidation and maintaining meat taste. However, high heme iron is likely to accelerate lipid peroxidation. Therefore, the level of iron in the diet should be controlled, preferably using an appropriate amount of organic iron. 5z5 China Feed Industry Information Network - based on feed, serving animal husbandry

Chromium is an essential trace element in pigs. The addition of chromium to the fattening pig feed not only has the function of resisting heat stress, but also improves the lean meat rate, daily weight gain and feed conversion rate of the pig, and reduces the body fat. As a component of glucose tolerance factor (GTF), chromium increases insulin activity. The addition of chromium to pig diets can reduce the stress of pigs during transport and before slaughter, thereby reducing the incidence of PSE meat and DFD meat, especially for pigs that are abnormally active and stress-sensitive. In addition, the addition of appropriate amount of chromium in the finishing pig feed can increase the lean rate of fattening pigs, reduce abdominal fat, and improve body shape. The form of chromium added to the diet is mainly organic chromium, such as chromium picolinate, yeast chromium and chromium methionine. 5z5 China Feed Industry Information Network - based on feed, serving animal husbandry

Selenium is a component of the in vivo antioxidant system glutathione peroxidase (GSH-px). GSH-px is present in cells and can remove peroxides from cells and protect lipids from oxidation. GSH-px synergizes with vitamin E to play a very important role in preventing the oxidation of cell membrane phospholipids and ensuring cell membrane integrity. The addition of organic selenium to pig diets can significantly reduce the loss of pork drip and improve the tenderness of meat. In addition, zinc and manganese are also activators of superoxide dismutase, which increases the levels of Zn and Mn in the diet and also helps prevent the production of PSE pork. 5z5 China Feed Industry Information Network - based on feed, serving animal husbandry