Efforts to obtain healthy chicken meat production require feed additives to increase the growth and quality of poultry livestock. Eco-enzymes are one of the natural feed additives because they contain organic acids which can increase poultry production. This study aims to determine the effect of using eco-enzymes in drinking water on production performance, carcass quality and internal organs of Lohmann roosters. The study used a completely randomized design (CRD) with 4 treatments and 6 replications. The treatment was the administration of eco-enzymes in drinking water: P0 (control / without administration of eco-enzymes in drinking water), P1 (2.5 ml/liter of drinking water), P2 (5 ml/liter of drinking water) and P3 (7.5 ml/liter of drinking water ). Variables observed were production performance, carcass quality internal organs. The results showed that the administration of eco-enzymes in drinking water had a significant effect (P<0.05) on body weight gain, FCR, live weight and carcass percentage of Lohmann roosters, but had no significant effect (P>0.05) on internal organs. The concluded that the administration of eco-enzymes in drinking water of Lohmann roosters at a dose of 7.5 ml/L can increase body weight gain 38.24%, improve carcass quality 4.44%, increase feed efficiency of 30.61% and do not have a negative effect on internal organs of roosters Lohmann.

Keywords: Carcass, Eco-enzyme, Rooster Lohmann