title: Rolled-head and nuclear-crest sperm defects in a rare case of presumeddiploidy in the bull.
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics* / Q000502:physiology; D004171:Diploidy; D005298:Fertility; D008297:Male; D008854:Microscopy, Electron; D013076:Sperm Count / Q000662:veterinary; D013094:Spermatozoa / Q000002:abnormalities* / Q000648:ultrastructure