Abstract
A total of 2400 broiler chickens were used in four experiments to estimate the effects of using 0.04, 0.08 and 0.16% aspirin (ASA) as dietary supplements. Not only did the ASA dietary supplementation have no significant (P < 0.05) beneficial effect on the incidence of sudden death syndrome but it also had a deleterious effect on overall mortality which was significant (P < 0.01) in two of the four experiments. Furthermore, the addition of ASA at 0.16% to the diet resulted in reduced body weights which were significant at P < 0.05 in two experiments and at P < 0.10 in the other two experiments. Key words: Aspirin, sudden death syndrome, broiler chickens, growth rate

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