title: Incidence of 1/29 translocation in Bolivian Creole and Brahman Yacumeño cattle.
abstract: In Bolivia, four different Creole cattle breeds can be found, as well as other European and Zebu breeds adapted to local environments. The relationship between the occurrence of the 1/29 translocation and subfertility is well known, and analysis of Y chromosome morphology is useful to determine a possible introgression with Bos indicus. The incidence of the 1/29 translocation was analyzed in four Bolivian Creole cattle breeds and the Brahman Yacumeño population, as well as on four farms with phenotypical Creole-type cattle. In 259 (164 dams and 95 sires) Bolivian Creole cattle, 10.42% of the individuals demonstrated the 1/29 translocation, with a variation from 0 to 28.20% between the breeds. In contrast, 43 (19 dams and 24 sires) Yacumeño Brahman and the Creole-type cattle did not show the centric fusion. The highly significant differences between Creole cattle breeds in relation to the incidence of 1/29 translocation could be a consequence of factors such as founder group, genetic drift, and selection. The low frequency observed in the Saavedreñio Creole dairy cattle might be explained by its breeding under a more intensive system, and selection according to milk yield and fertility traits. Finally, no relation between acrocentric Y chromosomes and 1/29 translocation was observed.
authors.affiliation: Centro de Investigaciones en Genética Básica y Aplicada, Facultad de Ciencias Veterinarias (U.N.L.P.), La Plata, Argentina. hendrik.debosschere@rug.ac.be
authors.forename: J C
authors.initials: JC
authors.lastname: De Luca
authors.forename: L
authors.initials: L
authors.lastname: Zufriategui
authors.forename: S J
authors.initials: SJ
authors.lastname: Picco
authors.forename: M V
authors.initials: MV
authors.lastname: Ripoli
authors.forename: G
authors.initials: G
authors.lastname: Giovambattista
authors.forename: F V
authors.initials: FV
authors.lastname: Rojas
authors.forename: F N
authors.initials: FN
authors.lastname: Dulout
mesh_terms: D000818:Animals; D001838:Bolivia; D002417:Cattle / Q000235:genetics*; D020732:Cytogenetic Analysis / Q000662:veterinary; D005260:Female; D005828:Genetics, Population; D008297:Male; D014178:Translocation, Genetic / Q000235:genetics*; D014998:Y Chromosome / Q000235:genetics*