ABSTRACT
This study was aimed to compare somatic cell count (SCC) of milk samples collected deriving from cows kept in different produce systems (milk type A and B). The 683 milk samples were taken from the mammary gland that did not show alteration in physicchemical neither on the tamis exams. The samples were separated in four groups: "clinically healthy", "carrier or infected", "no isolated mastitis organisms" and "infectious mastitis". After the statistical analysis, it was concluded that, no matter what kind of productive system, the majority of the samples was positive in CMT and/or organisms isolated; the SCC was more sensitive than CMT to identify slight variations as in "clinically healthy" and "carrier or infected"; the productive system did not interfere in most of SCC, but it was significant to study the presence and types of the isolated organisms. Sensitivity, specificity and efficiency were similar for both milk produce milk types; the SCC level of sensitivity was lower for the small cell count and higher with the increasing of the cell count, but this result was reversed for the specificity levels. It was proved to be better to identify samples without isolated organisms through the SCC efficiency study, using the SCC limit level of 100,000 cells/mL, although the average of the “carrier” group in both milk types A and B was near the limit.
KEY WORDS:
SCC; mastitis; milk type A and B; diagnosis; bovine.
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