64(2014) 11 MITTEILUNGEN KLOSTERNEUBURG www.mitt-klosterneuburg.com 59 Nov 2014 1 Effect of Natural Supplemental Ascorbic Acid (VC100) on Performance and Certain Haemato-biochemical Values in Broiler Chickens Exposed to Heat Stress Alaeldein M. Abudabos * , Elsayed O.S. Hussein and Abdullah N. Al-Owaimer 1 Department of Animal Production, College of Food and Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia *Correspondence should be addressed to: Dr. A. Abudabos. Department of Animal Production, College of Food and Agricultural Sciences, King Saud University, P. O. Box 2460, Riyadh 11451, Saudi Arabia. (Email: alabudabos@gmail.com)