Thirty samples of raw milk intended for processing, were analyzed during the period of high lactation. The results of the physico-chemical characteristics similar standards, only the fat content is relatively low, with an average of 30,9 g/L.
Microbiological analysis included nine microbial groups: hygiene indicators among groups (total flora, psychrotrophic flora, heat-resistant flora and coliforms) and some potentially pathogenic groups (coagulase-positive Staphylococci, Salmonella and Escherichia coli). The enumeration of mesophilic aerobic total flora, psychrotrophic and heat resistant serves to underline the high contamination of the samples analyzed with respective averages of 28,8.106CFU/mL 12,3.105CFU/mL and 44,2.104 CFU/mL.
Milk samples are also contaminated with total coliforms, faecal coliforms and faecal streptococci with respective average rates of 50,3.105CFU/mL 36,7.104CFU/mL and 55,4.105CFU/mL. The E.coli germ is present in 64% of the analyzed milks. The presence of pathogens is largely attributed to Staphylococci averaging 37,5.102CFU/mL, 80% of strains were coagulase positive. In contrast, all samples are free of Salmonella. In view of the Algerian standards, the hygienic quality of all samples analyzed milks, is bad.