The influence of two different CEY concentrations in a defined soy lecithin-based extender on semen parameters after the freeze-thawing is shown in Table 1. Regarding Caspian horses, semen extended with INRA2 had significantly higher post-thaw CASA motility and CASA progressive motility than those extended with the rest of extenders after freezing and thawing (P < .001). There were no significant differences in VAP, VCL, and ALH among the three groups (P > .05). For VSL (P < .01) the highest values were obtained from INRA4. The highest percentages of acrosomal and other abnormalities were found in semen diluted in INRA4 (P