RELATION BETWEEN THE GEOMETRICAL MEAN OF SOMATIC CELLS FROM BULK MILK AND THE PREVALENCE OF SUBCLINICAL INTRAMAMMARY INFECTIONS IN SHEEP AND GOATS

摘要

In order to implement a regional plan of measures against ovine and goats mastitis, a study has been done regarding the number of somatic cells from bulk milk of sheep and goat flocks in Bistri?a N?s?ud County. We analyzed samples of mixture milk (evening and morning) from 105 sheep flocks and 110 goat flocks. Based on monthly analyses, programmed between March and August 2007, we examined a total number of 618 sheep and 642 goats. The average of somatic cells from bulk milk was of 1,023,000 cells/ml in sheep and 1,344,830 cells/ml in goats, which represent increased values compared to the majority of other studies.The dynamic of somatic cells number from bulk milk was analyzed on four classes: 2,000,000 and in relation with the percent of primipara, old animals in late lactation, period and repartition of births.The results regarding the distribution of cell classes in ovine and goat milking flocks were visibly different to other studies. In flocks with increased average of somatic cells (more than 750,000 cells/ml in sheep and greater than 1,000,000 cells/ml in goats) the percentage of animals diagnosed with intramammary infections through somatic cells counting and individual bacteriological exam was of 79.37% in sheep and 70.21% in goats