DefinePK

Abstract

ABSTRACT


During the present study raw and pastuerized milk samples
were collected from the three major dairy factories during March- August
2001. The raw milk supplied by farmers to the selected factory was collected
from bulk tank. Similarly pasteurized milk samples, processed and distributed
by those factories, were randomly collected from three different food
stores and retailers of the Western Cape of South Africa. The frequency
of the isolation of the microorganisms, from both raw and pasteurized
milk, revealed a higher prevalence of S. aureus in the raw milk
15.38 followed by those of E. coli 14.3 that was also isolated
at a rate of 3.6 form pasteurized milk. Also, other mastitis-isolated
pathogens found were Streptococcus agalactiae 8.79, Streptococcus
dysglactiae 12.09, Streptococcus uberis 6.72, Enterococcus
faecalis 8.35 which was also found in 2.2 of the pasteurized milk
samples and Staphylococcus epidermidis 8.79 that were also found
in pasteurized milk 2.2. Other identified isolates, were also represented.
However, all samples revealed negative results for the growth of Salmonella
and Listeria monocytogenes. Descriptive and frequency analysis
showed higher means, standard error of means and standard deviation for
the somatic cell counts, total bacterial counts, coliform counts and E.
coli counts, although their minimum values revealed a negative or
a very low levels. A lower level was also obtained for the chemical content
fat, protein, lactose, SNF and total solids of the pasteurized milk
compared to the raw milk samples for all studied companies. Also the percentage
of the added water was very high in the processed milk compared to the
samples from herd raw bulk milk. Moreover the significant variation between
the measurements were estimated.

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