Abstract
Day old chick was raised 30 days long on the basal diet with or without terramycin in amount of 30 mg per kg of the diet. When the basal diet containing skimmed milk powder was used, the growth rate was increased by the addition of terramycin. But the number of caecum microorganisms, the concentration of serum calcium, and the contents of vitamin A, B_1,B_2,C of the liver and muscle were not affected noticeably. When a basal diet containing soybean oil meal was used, no marked change was produced by the addition of terramycin, contrary to our previous reports.
