Mahmoud, Usama T., Mohamed R. Fahmey, Mootaz A. Abdel-Rahman, and Madeha Hosney A. Darwish. 2014. “Effect of Propolis Supplementation on Serum Calcium, Phosphorus and Proteins Concentrations in Heat Stressed Broilers”. Journal of Advanced Veterinary Research 4 (3):117-22. https://www.advetresearch.com/index.php/AVR/article/view/83.