A bacterial strain of porcine lactic acid that is selected from: (i) NCIMB 41846; (ii) NCIMB 41847; (iii) NCIMB 41848; (iv) NCIMB 41849; (v) NCIMB 41850; (vi) NCIMB 42008; (vii) NCIMB 42009; (viii) NCIMB 42010; (ix) NCIMB 42011; (x) NCIMB 42012; and any combination of two or more thereof.Una cepa bacteriana de ácido láctico porcino que se selecciona de: (i) NCIMB 41846; (ii) NCIMB 41847; (iii) NCIMB 41848; (iv) NCIMB 41849; (v) NCIMB 41850; (vi) NCIMB 42008; (vii) NCIMB 42009; (viii) NCIMB 42010; (ix) NCIMB 42011; (x) NCIMB 42012; y cualquier combinación de dos o más de los mismos.