A total of 153 strains of lactic acid bacteria were isolated from Algerian goats' milk. The strains were identified according to morphological, biochemical and physiological criteria, as well as the use of the API system and SDS-PAGE technique. Identification of the isolates revealed the presence of six genera: Enterococcus (41.82%), Lactobacillus (29.40), Lactococcus (19.60%), Leuconostoc (4.57%), Streptococcus thermophilus (3.26%) and Pediococcus (1.30%). The predominant strains belong to Enterococcus faecium (24 isolates), Enterococcus durans (22 isolates), Lactococcus lactis subsp. lactis (25 isolates), Lactobacillus rhamnosus (9 isolates) and Lactobacillus delbrueckii subsp. bulgaricus (7 isolates).

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This study focused on the benefices effects of micro-organisms called probiotics that is Lactococcus lactis sbsp cremoris CNRZ 107, and propose different therapeutic possibilities of our situation against a pathogen Salmonella sp.We conducted two tests in vitro and in vivo; where it was noted that treatment in the presence of this lactic strain is effective because it causes a remarkable decrease of the pathogen agent.In the end, the effectiveness of this lactic strain was confirmed by testing for resistance to gastrointestinal conditions (pH, bile salts and digestive enzymes).

In order to study the race effect on the physico-chemical characteristics and protein profile, two sheep or ovine breeds Hamra and Ouled Djellal were raised in the same condition sat the ITELV (National institute of breeding) (Ain Hajar-Saida, Algeria). The analyses were focused on the pH, density, freezing, fat, total protein, dry defatted extract and total dry extract. The results obtained or these parameters showed no significant differences between the two races. Then the protein fractions were isolated and analyzed by Poly Acryl Amide Gel Electrophoresis (PAGE) under different conditions (native and in presence of urea). The resulting electrophoretic profiles have identified similarities between the two breeds milk.