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Microbial Assessments of Bulk Milk Before and After Pasteurization in Two Different Dairy Farms in Zaria, Nigeria |
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M.K. Lawan,
F.O. Abdulsalawu,
A. Suleiman,
T. Aluwong and L.S. Yaqub |
Abstract:
Milk has high nutritional values and an important source of protein, minerals,
vitamins and fat in human diet. It provides excellent medium for growth of both
pathogenic and spoilage microorganism. This study was carried out with the aim
of assessing the microbial quality of bulk milk before and after pasteurization,
in two different dairy farms in Zaria. Bulk milk samples were collected on daily
basis for a period of 30 days during which 30 samples each, of pasteurized and
raw milk were collected from each of the farms making a total of 120 milk samples.
The both samples of raw milk before pasteurization and post-pasteurization of
farm A and B were analyze for total aerobic, coliform plates counts and E.
coli isolation rates. Mean results of aerobic plate counts of raw milk for
farm A and B before pasteurization were; 5.70 and 6.04 log10 CFU
mL-1, respectively. These counts decrease to 3.76 and 4.20 log10
CFU mL-1 after pasteurization of the milk. Similarly, the E. coli
isolation rate for farm A and B were; 20 and 53.3%, respectively. These also
decrease to 6.7 and 13.3% after pasteurization. In addition, coliform counts
also follow similarly trend. The coliform count in farm A and B were; 5.32 and
6.49 log10 CFU mL-1, respectively. The counts decrease
to 3.16 and 3.74 log10 CFU mL-1 after pasteurization of
the milk. Total coliform and aerobic plates counts before bulk pasteurization
in both farms were significantly different (p<0.05), with post-pasteurization
values when subjected to paired t-test. The coliform and aerobic plates demonstrated
poor hygiene practices and inefficient pasteurization methods in both farms.
High isolation rate of E. coli in post pasteurization is an indicative
of fecal contamination of the bulk milk indicative of serious public health
concern. In conclusion, the present study has demonstrated poor method of pasteurization
couple with lack of good hygienic practices such as: proper solid waste management,
potable water, cleanliness of milking area and absent of milking installation.
These are all factors that contributed to production of poor quality milk in
both farms with high coliform, aerobic plates and high isolation rate of Escherichia
coli post pasteurization.
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How to cite this article:
M.K. Lawan, F.O. Abdulsalawu, A. Suleiman, T. Aluwong and L.S. Yaqub, 2012. Microbial Assessments of Bulk Milk Before and After Pasteurization in Two Different Dairy Farms in Zaria, Nigeria. International Journal of Dairy Science, 7: 103-108.
DOI: 10.3923/ijds.2012.103.108
URL: https://scialert.net/abstract/?doi=ijds.2012.103.108
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