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Batak onion ( Allium  chinense) is a local plant typical of North Sumatra and have several antimicrobial compounds, so it has the potential to be used as natural antibiotics. One of the bacteria that often infects the broiler chickens is  Escherichia  coli  which can reduce the carcass quality of broiler chickens. This research aimed to determine the influence of giving extract and powder of Batak Onions (Allium chinense) on carcass characteristics of broiler chickens infected by  Escherichia  coli . The research was using a completely randomized design with 7 treatments and 3 repetitions, and there were five broiler chicken for each repetition. The treatments were P0A: Control without infection, P0B: infected by  E. coli , P1: P0A + Batak Onion extract, P2: P0A + Batak Onion powder, P3: P0B + Batak Onion extract, P4: P0B + Batak Onion powder and P5: P0B + Tetracycline antibiotic of 0.05%. Research results indicated that the giving of batak onion extract and powder gave a significant difference to the carcass characteristics including slaughter weight, carcass weight and carcass percentage of broiler chickens infected with  Escherichia  coli . The conclusion of this research was that the giving of Batak onion extract and powder was effective in improving the carcass characteristics of broiler chickens infected with  Escherichia  coli .

The effect of Batak onion (Allium chinense) extract and powder adduction on the carcass characteristic of broiler chicken infected by Escherichia coli