Abstract
Moore et al. (1946) fed streptothricin to chicks in an attempt to minimize the influence of intestinal synthesis on vitamin requirements. They reported that 5,000 units of this antibiotic per 100 g. of purified diet did not affect growth but 10,000 units or more were toxic. In our laboratory streptothricin sulfate has been found to increase the growth rate of chicks receiving a vegetable protein, cereal grain basal diet.Day-old White Plymouth Rock mixed sex chicks from hens on a practical breeder diet were maintained in electrically heated cages with raised wire bottoms and fed ad libitum. The basal diet contained the following: soybean oil meal, 33.0%; ground wheat, 25.0%; ground yellow corn, 23.8%; ground oats, 10.0%; dried whey-product containing 50.0% lactose, 4.0%; dicalcium phosphate, 1.6%; pulverized limestone, 1.6%; sodium chloride, 0.5%; manganese sulfate, 130 ppm; riboflavin, 3.4 ppm; vitamin B12, 20 ppb. Results of four week growth trials are .
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