Incidence of 1 29 translocation in Venezuelan Creole bulls

The Venezuelan Creole breed cattle is a Bos taurus well adapted to tropical conditions; however, it has demonstrated a low fertility rate. Recently, improvement in animal production by selection based on chromosomal analysis has allowed for the erradication of abnormalities involved in fertility problems, especially that of the 1 29 translocation. In the present work chromosomal analyses were carried out on 60 Creole bulls. Heparinized peripheral blood cells were cultured rendering metaphase spreads and subsequently stained by G- and C-banding techniques. The 1 29 translocation was observed in 13 of the 60 bulls. The occurrence of this translocation in Creole cattle is discussed.