Abaxial implantation of the middle piece in spermatozoa and spermatids in related sterile boars.
D000818:Animals; D007248:Infertility, Male / Q000209:etiology / Q000662:veterinary*; D008297:Male; D013087:Spermatids / Q000648:ultrastructure; D013094:Spermatozoa / Q000002:abnormalities* / Q000648:ultrastructure; D013552:Swine; D013553:Swine Diseases / Q000473:pathology*