Puangkhum, Chudapun, Choawit Rakangthong, Theerawit Poeikhampha, Kanokporn Poungpong, and Chaiyapoom Bunchasak. 2019. “Effect of Supplemental Multi-Enzymes in the Diet of Meat-Type Ducks on Production Performance, Carcass Yields and Gastrointestinal Morphology”. International Journal of Poultry Science 18 (12): 648–655. https://doi.org/10.3923/ijps.2019.648.655.