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Provides the strongest evidence for cause-and-effect relationships Involves restrictive study population and environment that may limit generalizability of results to real-word settings     Allows testing of few variables     Often

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in Journal of the American Veterinary Medical Association

of calves developing diarrhea more than does vaccination?   Keywords: bovine, calf, vaccine, diarrhea, environment Should I use antimicrobial X to treat respiratory disease in cattle? In lightweight (200–250 kg [440–550 lb]) cattle

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in Journal of the American Veterinary Medical Association

environment, and age or body weight at the time of study initiation. When a sufficient number of animals are included in an experiment, randomization will eliminate the influence of unidentified confounding factors. The same is not necessarily true for

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in Journal of the American Veterinary Medical Association