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For this investigation, 2,673 dairy herds supplying milk to the Minneapolis-St. Paul market were divided into three study groups consisting of 681, 684, and 1,308 herds. All milk supplies were analyzed monthly by the catalase test and confirmatory microscopic evaluation was made on all samples showing 20% or higher oxygen. The study groups were treated as follows: Group I producers received no reports of tests made on their milk supplies and no field work was done; Group II producers were sent reports of tests, but no field work was done; Group III received reports of tests and where high somatic cell counts were observed, a fieldman assigned to the project made farm visits, assisted the producer where possible and filed a work sheet report on milking equipment condition and milking practices. Data were collected for slightly under two years, between August, 1969 and February, 1971. A total of 30,645 catalase determinations was made. Of these, 4,875 ( 15.9%) showed 20% oxygen and higher and 2,084 (6.8%) showed 30% and higher. In the latter group, 368 (1.2% of all samples) were confirmed by the microscopic method at 1.5 million or higher somatic cell count. By study group, the percentages of samples confirmed at 1.5 million or higher somatic cell count (for all catalase tests of 20% or higher) were 1.2, 1.4, and 1.5%, respectively. Using 1.5 million or higher somatic cell count as an actionable level, actionable cases by study group were 11.3, 10.4, and 12.0%, respectively. Lastly, considering three out of five actionable level counts as a basis for suspending permits, the percent of potential suspensions, by study group, were 0.14, 0.73, and 0.91%, respectively.

AN EVALUATION OF THE ABNORMAL MILK CONTROL PROGRAM1 RECOMMENDED BY THE INTERSTATE MILK SHIPPERS CONFERENCE (IMS)