Lactic acid in the 24 hour culture medium was analyzed using a colorimetric assay. Data represent averages (±SD in error bars, N=9) of three sets of separate experiments. ##P<0.001 vs SU and AU, <0.05 vs SOY, CHOC and AO; **P<0.001 vs COW, VAN and SO, <0.01 vs CHOC, and <0.05 vs SOY and AO; #P<0.001 vs SU and AU, and <0.05 vs CHOC; *P<0.001 vs SU and AU, <0.01 vs AO, <0.05 vs SOY.