Lactose malabsorption in two sibling rhesus monkeys (Macaca mulatta).
Observation of two sibling rhesus monkeys, Macaca mulatta, indicated that they were intolerant to lactose. While on a lactose formula the monkeys had severe diarrhea and weight loss but were otherwise healthy. When a lactose-free formula was instituted, the diarrhea abated and there was a steady weight gain.
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