A survey was carried out on the secretion of abnormal milk among dairy cows in the eastern part of Hokkaido. At the same time, those quarters of the udders secreting abnormal milk were treated with several drugs, including antibiotics.
Secretion of abnormal milk was found in 21.8 percent of the cows surveyed. The majority of the affected cows secreted milk of a little high abnormality showing reaction more than ++ of CMT and containing more than one million cells per milliliter. Etiologic organisms were a little different from area to area. In general, staphylococci alone were detected from about 43 per cent of the affected cows, streptococci alone from about 20 per cent, and both of them combined from about 22 per cent. Of the staphylococci detected, 54.5 per cent was coagulase-positive, and 74.2 per cent of the streptococci detected belonged to group B of Lancefield.
Secretion of abnormal milk was found mostly among cows milked by hand and frequently among those kept under no good management. Cows secreting abnormal milk from three or four quarters showed an average daily yield of milk 2.2 kg less than that given by cows secreting normal milk from the four quarters.
Treatment was made with an agent prepared by dissolving 100, 000 to 200, 000 units of penicillin Gsodium and 100 to 200 mg of combined streptomycin in 50 to 100 ml of 5 per cent glucose solution. This agent was injected into the cistern of an affected quarter only once after the evening milking. As a result, about one half of the affected quarters was cured to secrete normal milk.
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