In the rural survey, we found that many breeders often do not understand the antagonistic effects of various feed additives when they are raising livestock and poultry. They often mix and feed them together, so that they can not only achieve the desired effect, but also negative. effect. To this end, we will introduce some feed additives that can produce antagonistic effects as follows: 
1. Calcium and phosphorus are difficult to be absorbed in an alkaline environment, so calcium and phosphorus additives cannot be used simultaneously with alkaline additives such as choline. 
Second, phosphorus can reduce the absorption of iron by livestock and poultry organisms. Therefore, when adding iron to livestock and poultry, it is not advisable to add too much bone powder and calcium hydrogen phosphate. 
3. Magnesium will reduce the absorption of phosphorus by livestock and poultry organisms. Therefore, when adding phosphorus to livestock and poultry, do not add too much magnesium oxide and magnesium sulfate at the same time. 
Fourth, feeding calcium, magnesium, iron, aluminum and other trace element additives, can not use oxytetracycline at the same time, so as not to affect the absorption of trace elements in livestock and poultry. 
5. There is an antagonistic effect between zinc and calcium. Therefore, when adding zinc sulfate to the feed, it is not advisable to add too much calcium. 
6. Compounds containing iron, zinc, copper, manganese, iodine, etc., should not be mixed with vitamins A, K3, B1, B6 and folic acid.
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