Characterization of antisperm antibody binding patterns in relation to sperm phenotypic attributes and field fertility in dairy bulls

To test our hypothesis that antisperm antibodies (ASA) might alter sperm phenotypic attributes thus leading to sub-fertility/infertility in bulls, ASA were generated in crossbred male calves by immunizing with sperm two times. Cryopreserved spermatozoa from crossbred bulls (n = 24) with different field fertility ratings were incubated with ASA and different patterns of ASA immunolocalization were studied. In addition, sperm membrane integrity, acrosomal integrity and cryo-capacitation status were also assessed. Immunolocalization of sperm antigens using antisperm antibody revealed three major patterns (Acrosomal-AR, apical-AP and, acrosome and tail-AT). The proportion of ASA reactive spermatozoa was significantly (P