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The natural feed additives like herbs and edible plants have some properties as growth enhancers, to replace synthetic drugs. These natural feed additives, Nigella sativa seed, meal or oil, are given to birds to improve their physiological and productive performance under normal or stress conditions. Nigella sativa has no harmful effects on broiler performance and could be supplemented to overcome the deleterious effects of hot climatic conditions. The present study was designed to shed some light on the effects of feeding with different sources and levels of Black Cumin Seed (Nigella sativa L.) as natural feed additives on productive performance of broiler chicks reared in hot climatic conditions.