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• Used as a screening test on mastitis. Milk of infected cattle must not be sold
• All four tits of the udder require testing. A drop of milk is placed on the test zone. For healthy cows, the color turns to yellow-red (pH 6.4-6.6). A green (pH 7) or blue (pH 8) color indicates mastitis. If the indicator remains yellow, the pH of the milk is about 6.3. This finding is likewise pathological and requires further diagnostic or therapeutic action
• Color reaction: yellow to green to blue