Kefir production in Iran

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Kefir grains were prepared in a goat-hide bag using pasteurized milk inoculated with sheep intestinal flora, followed by culture of the surface layer in milk. From the grain, 11 strains of lactic acid bacteria, non-lactic acid bacteria and yeasts were isolated and identified. Six samples of kefir were prepared by fermenting pasteurized milk for different lengths of time. Sensory evaluation identified the sample prepared by 24 h fermentation as the best product.