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1. Estimated weight of the animal. If the weight of the animal is estimated in pounds (lbs), it should be converted to kilograms (kg), as dosages are expressed in mg/kg (milligram of drug per kilogram of body weight) required to produce immobilization. One lb equals .454 kg, and the conversion is made by multiplying the estimated lbs by .454. Thus a 100 lb animal weighs 45.4 kg. Since 1.0 lb is almost equal to 1/2 kg, a simpler conversion can be made by dividing the estimated weight in lbs by 2. By this method the 100 lb animal weighs 50 kg. Because of the difficulty in accurately estimating the weight of an animal and the safety margin of the CNS drugs, this simpler conversion is acceptable for fieldwork.
2. The dosage recommended for the species. This is the dosage recommended to produce immobilization in a particular species. Dosage recommendations may be provided by a veterinarian, by the drug package insert, or by consulting dosage tables in reference literature. The suggested dosage tables are given in mg/kg (milligram of drug per kilogram of body weight.)
3. Concentration of the drug used. The concentration (solution strength) of the drug is listed on the label of the vial, on the package, and in the package insert. It is given as mg/ml (milligram of drug per milliliter of liquid volume). To minimize the drug volume, and consequent size of the RDD Device, the highest available concentration of a given drug should be used.