An experiment (Exp) was conducted to determine the effects of two probiotic products (ProbiP and Lactozyme) supplementation in low CP diet on growth performance, carcass quality and E.coli in feces of Grimaud super meat duck. The experiment was conducted in a completely randomize design with 3 treatments and 3 replications with 20 ducks/pen (10 male + 10 female). The treatments were:1/ Cont: Control diet (optimum CP diet) without any product supplementations; 2/ PRO: 1% lower CP diet (Low CP) + 2g ProbiP/kg feed; 3/ LAC: Low CP diet + 2g Lactozyme /kg feed. Results showed that the average daily gain (ADG) of ducks fed Cont (66.58 g/head/day) was lowest, and the highest was found in LAC (69.15 g/head/day) and PRO (67.10 g/head/day). Average daily feed intake (ADFI) was almost similar in supplemented diets (153 g/head/day) to compare with control diet (150.9 g/head/day). Therefore, feed conversion ratio (FCR) of ducks fed LAC (2.10 kg feed/kg gain) was better than that in Cont (2.13 kg feed)/kg gain) and PRO (2.17 kg feed/kg gain). The density of E.coli bacteria in feces reduced in PRO (1.11 and 1.45 x10⁶ CFU /g feces) and LAC (1.16 and 1.55 x10⁶CFU /g feces) compared to Cont (2.23 and 2.14 x10⁶CFU /g feces) at 21 and 42 days, respectively. There was no difference in the slaughter parameters such as carcass proportion, thigh and breast meat percentage among ducks in 3 treatments. In conclusion, supplementation of Lactozymee and ProbiP in 1% lower CP diet of Grimaud duck diets tended to improve weight gain and reduce E.coli density in the feces compared with ducks feed optimum CP diet without any probiotic supplementation

Key words: Probiotic, ProbiP, Lactozyme, E.coli, Grimaud duck.