Microbiological quality of raw milk under a scheme of good milking and storage practices in a goat production system in the Lagunera Region, Mexico

Abstract

Dairy products provide essential nutrients when consumed and they also create rural employment. A small dairy can help a family maintain their livelihood. The objective of this study was to evaluate the microbiological quality of raw goat milk obtained during the milking-storage process using Good Hygiene Practices. The study was carried in northern Mexico, which is characterized by a desert climate. The experiment was carried in four herds, six samplings per herd with a total of 302 goats. Samples of milk extracted directly from the udder, milk extracted from the milking bucket and milk extracted from the storage bucket were analyzed. In addition, samples were taken from the milker’s hands. The data were analyzed using ANOVA and the statistical difference with the Tuky test (p < 0.05). A significant difference (p < 0.05) was observed in Total Coliforms (TC) for milker’s hands, milk extracted directly from the udder, milk extracted from the milking vat and milk extracted from the storage vat. However, at the time when the Good Hygiene Milking Practices GHPM treatment was stopped (June-July), higher CFU/mL of TC were observed in all stages of the milking-storage process. The pathogenic microorganisms identified were Escherichia coli, Salmonella spp. and Shigella spp. raw goat milk can be easily contaminated during the milking-storage process, since the common practice is to milk in the pen among other animals, manure and soil. To improve quality and sustainability parameters, it is necessary to have an exclusive space for milking as well as the implementation of GHPM. Better business alliances and better ethics between suppliers and industrial producers are also necessary.