IL6 and endometritis: Thus, the current study aimed (I) to investigate the expression profile of eca-miR-155, eca-miR-223, eca-miR-17, eca-miR-200a, and eca-miR-205, and (II) to measure the concentrations of IL-6, PGF2α, and PGE2, in serum of young and old aged mares with healthy and abnormal uterine status (endometritis).