Additional file 3. Rarefaction curves of 16S-rDNA pyrosequencing endometrial samples from healthy, metritic and septic metritic cows. Rarefaction curves of the number of OTUs are presented as a function of read number. H - healthy cows, endometrial swab samples; M - metritic cows, endometrial swab samples; BM - metritic cows, full-thickness uterine biopsy samples; BS - septic metritis cow, full-thickness uterine biopsy sample