The index for assessing and predicting fertility in mares

The evaluation of reproductive qualities mares is an important element horse breeding technology. Histological analysis the endometrium provides information about mare’s ability to conceive and carry a pregnancy term. article presents results histological studies in <10 (n=6) ≥10 (n=13) years old (yо). Two morphometric parameters were used for analysis: diameter (GDm) density (GDs) endometrial glands diestrus phase cycle. There was noted increase GDm (20.5 - 62.9 μm, p<0.001) decrease GDs (16.6 10.9 units per field view (ufov), p<0.1) older 10 yo. An index EI (GDm / GDs, μm/ufov) characterizing functional state has been proposed. rate level life foal birth after analyzed. A significant relationship with age (p=0.0133) fertility (p=0.0059) established. Among EI< 3 µm/ufov only one mare than all had foaled successfully. EI>3 µm/fov problems conception gestation. In our studies, range from 6 could be interpreted as reversible correct treatment it possible mares.