Calidad bacteriológica de la leche cruda en ganaderías de la provincia del Azuay

Abstract

The objective of this research was to analyze the bacteriological quality of raw milk produced in farms located in the province of Azuay. For which 45 farms were sampled according to the size of the herd and were divided into three groups: large, medium and small. The microbiological indicators that were examined were Mesophilic Aerobic counts, Total Coliforms, Escherichia coli and Staphylococcus aureus, this was done based on the interpretation guide for 3M Petrifilm plates, which are endorsed by the AOAC, NMK and AFNOR with their respective official methods indicated for milk and dairy products. Antibacterial sensitivity tests were performed for all the microorganisms studied. The means of bacterial counts in the province of Azuay gave the following results: Mesophilic Aerobios 3882599.97 CFU/mL, Staphylococcus aureus 4229.55 CFU/mL, Total Coliforms 5129.55 CFU/mL and Escherichia coli 24.48 CFU/mL. In the antibacterial sensitivity tests, it was observed that Total Coliforms, Escherichia coli and Mesophilic Aerobios are resistant to Ampicillin, Amoxicillin and Erythromycin, and have sensitivity to Ceftriaxone and Gentamicin. Staphylococcus aureus is resistant to Ampicillin, and is sensitive to Ceftriaxone, Gentamicin, Amoxicillin and Erythromycin.