Poultry feed to add copper is appropriate
Copper is one of the essential trace elements in poultry. It is distributed in various tissues and organs in the body. It plays an important role in poultry growth, development, immunity, and hematopoiesis by forming a variety of enzymes in the body to participate in the body's activities. Poultry natural feed ingredients, such as corn, soybean meal, etc., have low copper content, generally 7 to 15 mg/kg, and are mainly present in the bound state with low utilization. In order to maintain the normal growth and production of poultry, it is necessary to supplement copper in the feed as copper sulfate or amino acid chelated copper.
When there is a lack of copper in feed, poultry will develop copper deficiency, and the body's hematopoietic, osteogenic and keratin, collagen, elastin, and myelin production are all affected, resulting in anemia, altered coat, loss of myelin, and bone. A series of pathological changes such as osteoporosis can also cause pathological damage to immune organs, reduce immune function, increase the prevalence of poultry, and increase mortality.
If the level of copper added to the feed is too high, it can cause copper poisoning. Copper salts have a strong stimulatory effect, and high copper can cause severe gastroenteritis. Copper is also a multi-affinity poison that can act on various systems of the body after absorption and invade nerves, liver, kidneys and blood. Poultry long-term intake of high copper feed, loss of appetite, feather mess, wings drooping, severe paralysis of both limbs, lying in the ground or lame, slow growth, diarrhea, and finally weight loss, failure and death. The copper residues in the liver, kidneys and muscles of poultry fed on high-copper diets for a long period of time are significantly increased, and consumption of such poultry products can easily lead to human copper poisoning. High-copper feed will also increase the copper content in poultry manure. After the manure is applied to the soil, it will be absorbed by the plants. After the cattle and sheep feed on the high copper forage grass, it should cause poisoning and serious poisoning.
Since the discovery that high-copper (150-250mg/kg) feed can improve the growth performance of growing pigs, the phenomenon of adding high-copper to poultry feed, especially to broiler and poultry feed, is also relatively common, but the effect of high copper feed on meat poultry has been studied. It is inconsistent. Studies have shown that feed intake of meat ducks with 10, 95, and 150 mg/kg of copper has no significant change in growth performance, and even results indicate that compared with low-copper (10 mg/kg) feed, the copper content is 80 mg/kg. The feed of kg had a certain inhibition effect on the growth of ducks, but some results also showed that high copper (100mg/kg, 200mg/kg) had certain growth-promoting effects on ducks. Copper also has inconsistent results in the use of broiler chicken feed. Studies have shown that high copper feeds containing 110, 220, and 330 mg/kg of copper have a significant effect on the growth of broilers. Studies have also shown that they are added to broiler chicken feed. Copper of 100-300 mg/kg does not improve the performance of broilers.
In view of the inconsistent research results of high-copper feed in the application of poultry, combined with China's “Feeding standards for chickens†and some local standards for meat ducks, as well as the experience of breeding poultry and poultry, it is recommended that the level of copper in poultry feed be 6 to 12 mg/kg.
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