Bacteriological quality of raw bovine milk stored at the Mocha collection center. Tungurahua. Ecuador
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Abstract
Bacteriological quality of bovine raw milk has very important economic and health implications for the agricultural development worldwide. In this context, the present study was carried out to document the bacteriological quality of bovine raw milk stored in a collection center in the province of Tungurahua, Ecuador. A total of 20 milk samples obtained during the rainy and the dry season from the storage tanks of the transport routes together with samples from the collection center were analyzed. The following indicator of bacteriological quality were quantified: mesophilic aerobic bacteria, Enterobacteriaceae, Staphylococcus and Salmonella. These indicators adjust to the Ecuadorian INEN standards for bovine raw milk, which were quantified using the culture media and the incubation conditions indicated in the standards for each of the bacterial groups evaluated. In the rainy season average values for mesophilic aerobic bacteria were 1.22 x 108 CFU/mL, Enterobacteriaceae 7.90 x 105 CFU/mL and Staphylococcus 6.12 x 104 CFU/mL. In the dry season average values of mesophilic aerobic bacteria were 8.07 x 106 CFU/mL, Enterobacteriaceae 4.76 x 104 CFU/mL and Staphylococcus 1.42 x 104 CFU/mL. Salmonella was detected in 2 samples. Results of this study show that the bacteriological indicators of raw milk are high, implying deficiencies in the raw milk sanitary quality, especially during the rainy season.
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