Incidence of 1/29 translocation in Bolivian Creole and Brahman Yacumeño cattle

DE LUCA, J.C.; ZUFRIATEGUI, L.; PICO, S.; RIPOLI, M.V.; GIOVAMBATTISTA, G.; ROJAS, F.; DULOUT, F. N.

THERIOGENOLOGY

ELSEVIER SCIENCE INC

Año: 2002 vol. 58 p. 1273 - 1281

0093-691X

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 two hundred and fifty-nine (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 Saavedreño 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.