Commonly used veterinary drug dosage calculation methods




In the process of calculating the dosage of veterinary drugs, you must first clarify the weight and volume of the drug content, and the conversion between international units and milligrams. Do not confuse them. The following examples illustrate.
1. A pig farmer uses ciprofloxacin to treat swine diarrhea, using ciprofloxacin injection at a dose of 2.5 mg/kg body weight, drug specification content 2.5%, 10 ml (containing 0.25 g). For example, for a 55 kg pig, the amount required is: 2.5×55=152.5 mg. The content of ciprofloxacin in the injection is calculated to be 25 mg/ml, and the volume of the injection required for 152.5 mg of ciprofloxacin is calculated to be 152.5/25=6.1 ml. A 55 kg pig should be injected with 6.1 ml of ciprofloxacin.
2. A chicken farmer uses 10% florfenicol powder when treating coliform disease. Knowing that 100 grams are mixed with 200 kilograms of feed, such as 500 chickens, the feed intake is 0.25 kilograms, and the weight of the drug required is calculated according to the instructions: 500×0.25×100/200=62.5 grams. That is, 62.5 grams of 10% florfenicol, mixed thoroughly with 125 kg of feed, and fed directly. You can also mix 200 kilograms of feed directly with 100 grams of medicine according to the instructions.
3. A pig farmer uses peracetic acid solution for pig house disinfection. Generally, the concentration of peracetic acid is 0.3% to 0.5%, while the concentration of peracetic acid on the market is 20%. Specific preparation method: If the volume of the sprayer is 25 liters, the volume of 100% peracetic acid required to prepare a 0.3% solution is 25×0.3%=0.075 liters. The commercially available peracetic acid is 20%, so the volume of 20% peracetic acid required for preparation should be 0.075×100/20=0.375 liters. Prepare 0.3% peroxyacetic acid solution, calculate according to 25 liters, take 0.375 liters of 20% peracetic acid, and mix it with 25 liters of water.
4. Conversion between international units and milligrams. Generally, 1 mg of antibiotics is approximately equal to 1,000 units, that is, 10 mg is equal to 10,000 units. For example, when treating chicken colibacillosis, use gentamicin, its specification is 2 ml/tube (containing 80,000 units). If it is used for drinking, the dosage is 10 mg/kg body weight, and the preparation content is marked as 80,000 units. In practice, 10,000 units can be converted into 10 mg. One gentamicin (2 ml contains 80,000 units) can be used for drinking water for 8 chickens weighing 1 kg.
In addition, the abuse of drugs in actual livestock and poultry breeding and veterinary clinics has caused a series of problems, so the majority of veterinarians are required to scientifically and rationally apply drugs for standardized treatment, so that they can effectively treat diseases and reduce breeding costs. At the same time, the problem of drug residues in food is reduced.