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¹ Kafkas Üniversitesi Veteriner Fakültesi Hayvan Besleme ve Beslenme Hastalıkları Ana Bilim Dalı-Kars
² Kafkas Üniversitesi Veteriner Fakültesi İç Hastalıklar Ana Bilim Dalı-Kars - Antibiotics and chemotherapeutics have been used to stimulate growth, increase production and to avoid of infectious diseases in animal nutrition for years. But these substances have some risk factors to animal and human health like making resistance of microorganisms. Therefore in recent year`s probiotics, organic acids and enzymes are commonly used as an alternative. Probiotics are biologic products which are consisting of beneficial bacteria. They increase feed efficiency with altering intestinal flora in favour of beneficial bacteria. Enzymes and organic acids are mostly obtained from probiotic bacteria or fungus. Enzymes are used to increase feed digestibility and organic acids are used to prevent of pathogens` growing with decreasing intestinal pH. Keywords : Feed supplement, probiotic, organic acid, enzyme