Influencia de los microorganismos (Staphylococcus aureus y streptococcus agalactiae) en la calidad de la leche de 4 centros de acopio de la parroquia San Andrés

Abstract

This research aimed to analyze the influence of Staphylococcus aureus and Streptococcus agalactiae microorganisms on the quality of milk collected from four aggregation centers in the San Andrés parish. The study started by implementing a checklist of good milking practices, coupled with physicochemical and microbiological analyses of milk before and after training sessions for the suppliers of the collection centers. The initial results from the checklist indicated that suppliers from the Asoprogar and La Silveria collection centers showed lower compliance with the required activities before and during milking, while those supplying Madrilact demonstrated a better compliance. The physicochemical quality of the milk varied according to the collection center, with statistically significant differences observed in the fat content, protein, total solids, and acidity. The Resazurin test determined that Madrilact and Tahualag collection centers produce high-quality milk as they exceeded the 5-hour reduction limit. Microbiological analysis revealed the presence of Staphylococcus aureus in the received milk before training, ranging from 2.17 to 6.67 CFU/ml. After training, it was possible to notice a significant reduction, ranging from 0.83 to 4.67 CFU/ml, showing a similar trend for Streptococcus agalactiae. The organoleptic characteristics of the milk received at the collection centers met the standards outlined in NTE INEN 9:2012. Finally, promoting good milking practices (GMP) among the suppliers of collection centers is an aspect to consider to ensure the production of a quality product.