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1. Adjust Milk Composition & Blend IngredientsMilk composition may be adjusted to achieve the desired fat and solids content. Often dry milk is added to increase the amount of whey protein to provide a desirable texture.

Ingredients such as stabilizers are added at this time.2. Pasteurize MilkThe milk mixture is pasteurized at 185°F (85°C) for 30 minutes or at 203°F (95°C) for 10 minutes. A high heat treatment is used to denature the whey (serum) proteins. This allows the proteins to form a more stable gel, which prevents separation of the water during storage.

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The high heat treatment also further reduces the number of spoilage organisms in the milk to provide a better environment for the starter cultures to grow. Yogurt is pasteurized before the starter cultures are added to ensure that the cultures remain active in the yogurt after fermentation to act as probiotics; if the yogurt is pasteurized after fermentation the cultures will be inactivated.3. HomogenizeThe blend is homogenized (2000 to 2500 psi) to mix all ingredients thoroughly and improve yogurt consistency.

4. Cool MilkThe milk is cooled to 108°F (42°C) to bring the yogurt to the ideal growth temperature for the starter culture.5. Inoculate with Starter CulturesThe starter cultures are mixed into the cooled milk.

6. HoldThe milk is held at 108°F (42°C) until a pH 4.5 is reached. This allows the fermentation to progress to form a soft gel and the characteristic flavor of yogurt.

This process can take several hours.7. CoolThe yogurt is cooled to 7°C to stop the fermentation process.8. Add Fruit & FlavorsFruit and flavors are added at different steps depending on the type of yogurt.

For set style yogurt the fruit is added in the bottom of the cup and then the inoculated yogurt is poured on top and the yogurt is fermented in the cup. For swiss style yogurt the fruit is blended with the fermented, cooled yogurt prior to packaging.

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