Computational evaluation of chromatin condensation and morphometric characteristics of rabbit (Oryctolagus cuniculus) sperm head

The correlation between the head morphometry and the intensity of condensation and heterogeneity of sperm chromatin were investigated in rabbit (Oryctolagus cuniculus). To this, 35 semen smears from New Zealand rabbits were stained with toluidine blue and evaluated by computer image analysis. The images were obtained in digital grayscale and analyzed by algorithms developed in the Scilab programming environment. The measurements obtained from the sperm heads were area, perimeter, length, width, length:width ratio, ellipticity, shape factor, lateral and anterior-posterior symmetries, and Fourier descriptors. The intensity and heterogeneity of the compaction of sperm chromatin was also evaluated. The rabbit spermatozoa showed chromatin heterogeneity and condensation more intense than the bull spermatozoa, and it was observed correlation between morphometric characteristics of the head and chromatin compaction and heterogeneity. The results suggest that chromatin is important for the morphological constitution of the head morphology spermatozoa head, as well as, rabbit sperm chromatin is inherently more heterogeneous and less condensed than the bull sperm chromatin

image analysis; sperm morphometry; toluidine blue; chromatin alterations