C. Puangkhum, C. Rakangthong, T. Poeikhampha, K. Poungpong, and C. Bunchasak, “Effect of Supplemental Multi-Enzymes in the Diet of Meat-Type Ducks on Production Performance, Carcass Yields and Gastrointestinal Morphology”, Int. J. Poult. Sci., vol. 18, no. 12, pp. 648–655, Nov. 2019, doi: 10.3923/ijps.2019.648.655.