Effect of Feeding Several Sulfonamides and Related Compounds on Growth of Chicks.

1. Young chicks fed diets containing Gantrisin® (sulfisoxazole) at levels of up to 1% of the diet showed no physical abnormalities, were more uniform and thrifty in weight and appearance than the controls and weighed heavier than the controls at 6 weeks of age. 2. Young chicks fed diets containing .03% of Ro 2-0404 or from .03 to 0.3% of Ro2-O201 were also thriftier in appearance and heavier than the controls and showed no physical abnormalities. Young chicks fed diets containing 1% or 0.3% of sulfamethazine, sulfadiazine, sulfanilamide, sulfaguani-dine or sulfaquinoxaline were markedly retarded in their growth.