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Routine milking in a 50-cow herd was with machines assembled so that the left half of the udder was milked with wide bore inflations and the right half with narrow bore inflations. The effect on udder health was measured by monthly individual quarter California Mastitis Tests (CMT), quarter bacteria cultures, and individual mastitis treatment records for cows leaving the herd. Udder irritation as measured by CMT was significantly (P <.01) reduced with narrow bore inflations. The total number of quarter milk samples showing bacteria (pathogenic or non-pathogenic) was lower on the side milked with narrow bore inflations. Clinical mastitis was more frequent (P <.05) on the side milked with wide bore inflations.
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Dillon et al. (1969) studied this question.
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