Hammod , A. J., Alshukri, A. Y., Areaaer, A. H., Alfertosi, K. A., & Alyasari, A. F. (2018). The Effect of Adding Oak Bark Powder to the Diet on Some Productive and Immunological Characteristics of Broiler Chicks. International Journal of Poultry Science, 18(1), 7–13. https://doi.org/10.3923/ijps.2019.7.13