The experimental work of the present study was conducted at the Poultry Farm; Agricultural researches and Experiments Station; Faculty of Agriculture, Mansoura University, Egypt. The experimental feeding trial of this study was carried out during the period from June to August 2000. The aim of the study was to investigate the possibility of alleviating the adverse effects of heat stress to which broiler chicks are exposed during the summer season by means of early-age feed restriction (EFR) and dietary supplementation with potassium chloride (KCl), either singly or in combination. A total...