SUMMARY
The present study was conducted to assess the effects of thermal stress on the serum biochemicaland haematological parameters in broiler chicken. Forty CARIBRO- Vishal broiler chicken weredivided into two groups with twenty birds each. The control group was kept at room temperatureand treatment group was exposed to thermal stress under 401 C for 4 hours at 35 day of age.The exposure of thermal stress significantly increased (P less than 0.05) the value of serum biochemicalparameters (glucose, cholesterol and triglyceride), heterophills, H/L ratios and basophills, howeverthe value of total leukocyte, haemoglobin, haematocrit value, and monocytes decreased significantly(P less than 0.05).