Olive industry wastes are the feed additives which are in the important phenolic structure are generally used in poultry nutrition. The oleuropein in the phenolic structure is found naturally in olive leaf and fruit and is a compound with antimicrobial, antiparasitic, antihelminthic, antioxidant and digestive auxiliary effects. Heat stress causes serious economic loss by increasing deaths in poutry. This study was undertaken to investigate the effects of egg shell and oleuropein feed additives on renal ARGINASE activity levels in heat stressed quails. In the study, 128, 15-day old quails were randomly divided into 4 groups. Groups were named as control, eggshell (ZYK), egg shell + oleuropein (ZYK+OLE) and oleuropein (OLE). As a result, arginase activity levels were found to be statistically significant. A significant decrease in arginase activity (P<0.01) was found in the study when compared to the control group of ZYK+OLE and ZYK groups, but no significant difference was found between the control group and the OLE group. Moreover, there was no statistically significant difference in the comparisons between ZYK+OLE, ZYK and OLE groups. As a consequence, it was observed that the feed additives had a positive effect on the heat stress by lowering the renal arginase levels.