Evaluation of Physico-chemical Properties and Microbiological Quality of Milk Collected from Different Dairy Farms in Sylhet, Bangladesh

Copyright © 2015 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract This study deals with the inspection of physical, chemical and microbiological quality of liquid cow’s milk collected from four different dairy farms in Sylhet, Bangladesh. Several milk compositions were examined and assessed to the Bangladesh Standards (BDS) and Food and Agriculture Organization (FAO). Results showed that tastes of all milk samples were slightly sweet and the mean specific gravity (1.029±0.0025 to 1.032±0.0015) was within standard range. The color of milk of sample 1 displayed similarity to sample 3, and likewise sample 2 to sample 4. However, all milk samples were normal except sample 2 which indicated cowy flavor and odor. The average statistics for fat (3.40±0.26), protein (3.47±0.11), total solids (12.16±0.33), solid not fat (8.76±0.32), acidity (0.19±0.03) and pH (6.67±0.10) were recorded. The Microbiological conclusion confirmed the presence of microbial population in all milk samples. The highest level of microbial quality in Standard Plate Count (SPC) was 38.1×106 cfu/ml in sample 3 and in logarithm the value is 7.58 cfu/ml. Grades of milk were evaluated by Methyl Blue Reduction Test (MBRT) and this phenomenon testified that milk of sample 2 was fair in qualities than others. Statistical analysis revealed that there was no significant difference (P>0.05) in the average values of acidity between results of milk samples to the BDS and FAO standards