Abstract
Two trials were conducted to investigate interactions in the effects of urea and chlortetracycline on the growth of steers. Rate and efficiency of live-weight gain were the response criteria used. Trial I consisted of an 84-day trial in which steers were individually fed. Trial II consisted of a 102-day trial in which cattle were group fed. In neither trial was any interaction found between the effects of urea and chlortetracycline on rate of gain. In both trials, replacing soybean meal with urea as a source of supplemental protein reduced gains. The inclusion of the chlortetracycline in the ration did not produce any significant effect on rate or efficiency of gain. In trial II, a significant interaction (P < 0.10) was found between urea and chlortetracycline for feed required per pound of gain. Since only 12 observations are involved in this comparison, the significant interaction requires confirmation.
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