K+, and BW. The interaction of ammonia and light inten- sity for 7 d further exacerbated physiological variables. The main effect of ammonia was more pronounced than that of light intensity. These conditions worsened as the duration of ammonia concentration exposure and light intensity increased from d 7 to 14 of exposure. However, allaffectedvariablesreturnedtonearnormalatlatertime pointsintheexposedchickenssothattheapparenteffects were lost. Plasma corticosterone and glucose concentra- tions were not significantly altered by exposure to dif- fering levels of ammonia orlight intensity, suggesting an absence of stress related to ammonia, light intensity, or theirinteraction.Itwasconcludedthatexposureofbroiler chickenstoaerialammoniaconcentrationsof0to50ppm fromd1to14posthatchinthepresenceoflightintensities ranging from 0.2 to 20 lx had no direct effect on some physiological blood variables and did not induce stress in broilers.