A calf with pinkeye weighs 100 lbs and requires a dose of 10mg/kg of oxytetracycline. How many milligrams are needed for one dose?

To determine the correct dosage of oxytetracycline for the calf, start by converting its weight from pounds to kilograms. Since there are approximately 2.2 pounds in a kilogram, the weight of the calf in kilograms is calculated as follows:

100 lbs ÷ 2.2 lbs/kg = approximately 45.45 kg.

Next, to find the required dose of oxytetracycline, multiply the dosage needed per kilogram by the total weight in kilograms:

10 mg/kg × 45.45 kg = 454.5 mg.

This calculation shows that for a calf weighing 100 lbs, a dosage of 454.5 milligrams of oxytetracycline is needed for one dose. Thus, the correct answer is 454.5 milligrams.