PCR-DGGE profiles of the gastrointestinal bacterial community of Buffalo 1 (A) and Buffalo 2 (B); marked with numbers are the selected bands for DNA sequence analysis. RF: Rumen fluid samples; RD: Rumen digesta samples; RT: Rumen Tissue samples; RE: Reticulum digesta samples; RET: Reticulum tissue samples; OM: Omasum samples; AB: Abomasum samples; DU: Duodenum samples; JE: Jejunum samples; IL: Ileum samples; CE: Cecum samples; CO: Colon samples and REC: Rectum samples.