Codex regulation for yogurt states that the minimum milk protein content is 2.7% and 5.6% for concentrated yogurt. The mean protein percentage of the strained yogurt even after 12 h of straining was less than the specified protein content as stipulated by Codex Alimentarius. This may have been due to the addition of flavor after the straining process which added to the bulk of the yogurt and notably reduced the protein content of concentrated yogurt (Thompson, 2011). The yogurt strained for 8 and 12 h had almost the same amount of whey eliminated as well as yield percentage. The more whey is drained in yogurt, the more it will be less susceptible to wheying-off. Wheying-off has a negative effect on consumers because whey separation and viscosity are among the most crucial aspects of the quality and overall sensory consumer acceptance of yogurt. Moreover, it can be misconstrued as a sign of spoilage. Because of the strained yogurt’s stability against wheying-off, there will be no more need for stabilizers such as pectin, gelatin and One of the factors that can affect the whey drainage and yield is the milk solids since milk solids have good water holding capacity owing to the properties of proteins in binding moisture. Straining the fermented milk at 5° rather than 25° also contributes
to the higher yield due to greater retention of moisture at low temperature. Polymer-producing starter cultures produce very viscous strained yogurt and longer time is required for whey
extraction. Also, use of strains producing exopolysaccharides results in lower yield (Law, 1997). Chandan and Kilara (2013) also reported that the yield of the strained yogurt from sheep milk had the highest yield followed by goat’s milk and cow’s milk.