this experiment was conducted to study of using different level and treatments of common vetch (visia sativa) on broiler performance in a completely randomized design with 10 treatments, 4 replications and 10 chicks in each, using 400 cobb500 broiler chicks. treatments were: corn-soybean meal based diet as control , and unprocessed or processed common vetch seed (water or autoclaving) each at 3...