Abdel-Rahman, Mootaz Ahmed, and Gamal Mohamed Mosaad. “Effect of Propolis As Additive on Some Behavioural Patterns, Performance and Blood Parameters in Muscovy Broiler Ducks”. Journal of Advanced Veterinary Research, vol. 3, no. 2, Apr. 2013, pp. 64-68, https://advetresearch.com/index.php/AVR/article/view/117.