Resumo

SERNA C, LILIANA; VALENCIA H, LEIDY JOHANA  e  CAMPOS G, RÓMULO. LACTIC ACID BACTERIA WITH ANTIMICROBIAL ACTIVITY AGAINST PATHOGENIC AGENT CAUSING OF BOVINE MASTITIS. Rev.Bio.Agro [online]. 2011, vol.9, n.1, pp.97-104. ISSN 1692-3561.

The use of antibiotics to treat bovine mastitis, produces antibiotic residues in milk and decreased quality of dairy products. Lactic acid bacteria have been proposed as an alternative to avoid the use of antibiotics. This paper reports the antimicrobial activity against pathogens responsible of bovine mastitis, of 4 lactic acid strains isolated from cattle in a state of acidosis ruminal. It also evaluated the specific growth rate (m) and antimicrobial activity of one of the strains, using two concentrations of carbon source (20 and 60 gl-1) in the commercial substrate MRS. The strains were biochemically identified as Lactobacillus acidophilus, Lactobacillus brevis, Lactobacillus fermen-tum and Weissella confusa. Weissella confusa showed the best antimicrobial activity against the major pathogens responsible of bovine mastitis. When has been used 60 gl-1 of total sugars in the fermentation substrate, was obtained diameter of inhibition of 31 mm for Staphylococcus aureus and 36 mm for Streptococcus agalactiae. The antimicrobial activity of Weissella confusa is superior antimicrobial activity reported by many other lactic acid bacteria, therefore Weissella confusa could potentially be used to prevent bovine mastitis.

Palavras-chave : Lactic Acid; Mastitis; Streptococcus Agalactiae; Staphylococcus Aureus.

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