A feeding trial was carried out to compare the growth-stimulating effect of chlortetracycline, oxytetracycline and oleandomycin for growing-finishing swine for a period of 9 weeks using 72 hogs of Landrace × Yorkshire crossbred weighing an average of 44㎏ in body weight. The results obtained are summarized as follows: 1. Body weight gain of exprimental group fed 25g of chlortetracycline per ton of feed was significantly (p$lt;0.05) better than those fed oxytetracycline 15g or control, Generally, supplementation of antibiotics in the ration of growing swine resulted in more body weight gain than control. It was found that there was no difference between pigs fed chlortetracycline 25g, oxytetracycline 25g or oleandomycin 5g in body weight gain. 2. Experimental pigs fed chlortetracycline 25g and oxytetracycline 25g consumed significantly (p$lt;0.05) more feed than the other antibiotic fed groups or control group. There was no difference in the amount of feed intake between oleandomycin 5g group and control group. 3. Supplementation of antibiotics to the growing-finising swine could improve feed conversion rate, although no statistical significance was detected. It was found that feed efficiency obtained from the group fed oleandomycin (3.95 on the average) was much better than those fed chlortetracycline or oxytetracycline (4.14 on the average). Present data revealed that approximately 7% of feed efficiency could be improved by feeding oleandomycin at the level of 5g per metric ton of feed. Additional improvement of feed efficiency could be obtained when 50g of Mecadox per ton of feed was fed during early growing period of pigs (10-45㎏ of body weight) and then fed 5g per metric ton of oleandomycin during later period of growth (45-90㎏).