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Skimmilk powders suitable for recombination into evaporated milk were experimentally manufactured from bulk milks containing varying proportions of subclinical mastitis mlik. Addition of milk from quarters infected by subclinical mastitis to milk from healthy quarters invariably altered the heat stability of the manufactured powder. The heat stability of the powder could not be predicted from the heat stability of the milk. The position of the natural milk on the heat stability curve was altered by heat treatment, and the extent of alteration was influenced by the proportion of milk from subclinical mastitle quarters present.
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Feagan et al. (1966) studied this question.
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