In livestock and poultry breeding, some feeds and additives often have antagonism with drugs for preventing and treating diseases, lighter ones reduce or lose the efficacy of the drugs, affect the control effect, and in severe cases can also produce toxic reactions. Therefore, livestock and poultry must pay attention to "treasures" when carrying out disease prevention and treatment. 1, tetracycline antibiotics. Tetracycline, oxytetracycline and other tetracycline antibiotics should be used to avoid feeding soybeans, black beans and their cakes, and should not be fed with feed additives such as powder, bone powder, eggshell powder and gypsum. Because such feed additives contain calcium, magnesium, and other elements, these elements combine with tetracycline drugs to form complexes that are insoluble in water and difficult to be absorbed, resulting in a reduction or loss of drug efficacy. 2. Penicillin and streptomycin should not feed feed additives containing oxytetracycline, and stop feeding silage and distiller's grains. Because these feeds and additives are more acidic, the efficacy of penicillin and streptomycin in the more acidic environment is easily destroyed. 3. Trichlorfon. The use of trichlorfon to drive off parasites in livestock and poultry should avoid feed supplements containing baking soda. Because of the strong alkalinity of baking soda, trichlorfon can be converted into highly toxic dichlorvos and cause serious poisoning. 4, sulfa drugs. Avoid feeding sulfur-containing feed additives. Such as artificial salt, sulfate, gypsum and so on. Sulfur can cause sulfa hemoglobin sepsis due to the toxicity of sulfa drugs to blood. 5, vitamins. When preventing and treating livestock and poultry vitamin A deficiency, they should avoid feeding regular trace element additives. Because this type of feed additive can cause vitamin A to be destroyed, the efficacy of vitamin A can be reduced or lost. At the same time, cottonseed cakes should also be stopped to avoid affecting the absorption of vitamin A by livestock and poultry. 6, ferrous sulfate. When using ferrous sulfate drugs, avoid feeding wheat bran. Because of the high phosphorus content of wheat bran, it will inhibit the absorption and utilization of iron in medicine. At the same time, drug treatment of livestock and poultry cartilage should avoid feeding wheat bran. 7, prolactin drugs. Lack of milk after the animal's postpartum, after the use of prolactin drugs, should avoid feeding malt. Malt has a back milk effect. When using herbs such as raw land, ripe land, fleece-flower root, and Pinellia, blood meal should be avoided. Otherwise, side effects will be aggravated. Source: "Rural Science and Technology Development"