Abstract
Forty-two baby pigs were utilized in a study of the riboflavin requirement at 85°F. and 70% relative humidity. The basal “synthetic milk” diet was supplemented with varying levels of riboflavin, and the response of pigs so fed was compared with respect to feed intake and weight gain to the behavior of pigs fed the same diet supplemented with an abundant quantity of riboflavin. A modified method of paired feeding for equal intake was utilized. It is concluded that the requirement of the baby pig, maintained under the conditions of this experiment, for riboflavin lies between 1.5 and 2.0 µg per gram of feed dry matter. The rectal temperature of baby pigs kept under these conditions rose progressively from 102.8°F. to 104.8°F. during the 8 weeks of the experiment.