The aim of this study was to find out the effects of chronic heat stress on total count leukocyte and differential leukocyte of broiler. A total of 20 broilers with three weeks ages divide into two different groups. Group one is for control (Po) was caged at normal temperature, and group two (P,) was caged at manipulated fix temperature on 34,5-35°C. After 45 days of treatment, all broilers we…