The data provided encompasses a comprehensive analysis of various parameters related to the production, carcass specifications, blood, and immunity of three duck breeds: Molar, Mascufy, and Pekiny. The significance of differences is indicated by P>0.05 unless specified. In terms of production indicators, Pekiny ducks displayed superior body weight and body weight gain at the end of the growth stage (BW10). These differences were statistically significant, signifying the breed's potential for higher weight gain. Pekiny also showed advantages in feed intake (FI) but not in feed conversion (FC) efficiency. Carcass specifications revealed that Mascufy had the heaviest carcasses and the highest edible weight and percentage, while Pekiny had the lightest carcasses and the lowest edible weight and percentage. These differences were statistically significant and highlight the potential for Mascufy in meat production. Examining blood parameters before and after injection, most values showed no significant differences among the duck breeds (P>0.05). However, parameters related to lipid profiles, such as Cholesterol, HDL, LDL, and Triglycerides, exhibited breed-specific differences. In summary, the analysis underscores the potential for significant differences in various aspects of duck production, including body weight, carcass specifications, and blood biochemical. These differences have practical implications for breed selection and management in the poultry industry. Further research is essential to explore the underlying mechanisms and implications of these variations and to optimize production outcomes and health in duck farming.