Bacteriological Analysis of Cow Milk (Nono) Sold Within Gusau Metropolis, Zamfara State

Abstract

Fresh cow milk popularly called Nono was collected from ten (10) different sellers at different areas within Gusau metropolis and one control was collected directly from a lactating cow and transported immediately to Microbiology Laboratory of Federal University Gusau where they wereassessed for their bacteriological quality. The total bacteria viable count of the ten Nono samples ranged between 6.6 x105 to 2.7 x106 cfu/ml, the total coliforms count ranged between 4.2x105 to 2.2x106cfu/ml, the range of the total Staphylococcal count and total lactic acid bacterial count were 2.5x105 to 4.0x106 cfu/ml and 5.9x105 to 1.7x106 cfu/ml respectively. The control sample had total viable count of 5.6 x 103 cfu/ml, total staphylococcal count of 3.2 x 103 cfu/ml, total lactic acid bacteria count of 4.2 x 103 cfu/ml whereas the coliform count gotten was too few to count (TFTC). The isolates were identified based on their morphological characteristics, Gram's reactions and biochemical profiles and a total of seventy-four (74) bacterial isolates belonging to the genus Lactobacillus, Leuconostoc, Streptococcus, Micrococcus, Pediococcus, Escherichia coli, Pseudomonas, Proteus, Klebsiella, Enterobacter and Staphylococcus spp. were identified from the eleven samples analyzed. The presence of Lactic Acid Bacteria in Nono is very good as they are one of the most significant groups of probiotic which not only enhance lactose digestion but also stimulate the immune system, However, the presence of E. coli and the other enterobacteriaceae and Staphylococcus sp. is of public health concern because they can cause several diseases therefore it was concluded that the bacterial loads of the Nono samples were not satisfactory with the exception of the control which had organisms within the acceptable limit of 30,000/ml for raw milk. The presence of potential pathogenic bacteria in all of the Nono samples is an indication that the samples were contaminated and this can potentially cause diseases to the consumers, Hence the need for public enlightenment for handlers and producers of Nono to observe good manufacturing practices in production and storage of the product to avoid outbreak of infections associated with the organisms encountered in this study.