185. The incidence of mastitis in cows yielding milk low in solids-not-fat

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Abstract
1. In a field investigation covering twenty-nine herds, an average of 19·5% of the animals in milk during the first three months of 1937 were yielding milk low in solids-not-fat, estimated by the routine method, at two consecutive milkings. 2. Of the low solids-not-fat cows which were not stale, evidence of mastitis infection was found in an average of 61·5% of cases. Re-examination of some negative animals suggests that the total infection amounted to about 70%. 3. There were apparently at least twice as many “subclinical” cases of mastitis as clinical cases.

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