title: Immotile short-tail sperm defect in Nelore (Bos taurus indicus) breed bulls.
abstract: This case study reported the presence of short tail sperm defect in the semen of three Nelore breed bulls. The sperm presented 0% of motility in the three animals evaluated and a total of 70%, 61% and 34% of pathologies of the intermediate piece of the tail respectively for animals 1, 2 and 3. It was identified that animals 2 and 3 had high degree of inbreeding, although no relationship was found with animal 1. Animal 2 was the only one that presented inbreeding coefficient (6.25%). His half-sib (animal 3) and animal 1, from the same herd, had shown no inbreeding, showing that inheritance is not the only determinant factor for its incidence on Nelore males.
authors.affiliation: Faculdade de Medicina Veterinária e Zootecnia/UNESP–Botucatu, SP, Brazil.
authors.forename: J B
authors.initials: JB
authors.lastname: Siqueira
authors.forename: R O
authors.initials: RO
authors.lastname: Pinho
authors.forename: S E F
authors.initials: SE
authors.lastname: Guimarães
authors.forename: T
authors.initials: T
authors.lastname: Miranda Neto
authors.forename: J D
authors.initials: JD
authors.lastname: Guimarães
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics*; D008297:Male; D013082:Sperm Tail / Q000473:pathology*; D013094:Spermatozoa / Q000002:abnormalities* / Q000166:cytology*