Abstract

MEZA-LOPEZ, Carlos et al. Prevalence of the Robertsonian (1;29) translocation in cattle in the state of Zacatecas, Mexico. Rev. mex. de cienc. pecuarias [online]. 2015, vol.6, n.3, pp.295-304. ISSN 2448-6698.

The purpose of this work was to estimate the prevalence of the Translocation 1;29 (t rob 1;29) in cattle herds in the Mexican state of Zacatecas. Blood samples were obtained from 661 bovines of eight breeds: Holstein (n= 284), American Swiss (n= 213), Braunvieh (n= 69), Simmental (n= 13), Angus (n= 5), Creole (n= 65), Chianina (n= 3) and Charolais (n= 9). Sampling was conducted in nine municipalities of the state of Zacatecas and one in the state of Aguascalientes. Age, sex and productive purpose were also recorded. Identification of the t rob 1;29 was performed by conventional cytogenetic technique. An overall prevalence of 4.1 %, with no differences between males and females (6.0 vs 3.4 % respectively), although greater (P<0.10) in young animals vs adults (5.4 vs 2.6 % respectively) was observed. Breed differences (P<0.001) were observed with a greater prevalence in the Criollo breed (12.3 %), followed by Swiss American breed (7.5 %) and lower among Braunvieh (1.4 %), Holstein (0.4 %) and others breeds (0.0 %). According to productive purpose a greater prevalence (P<0.001) was observed in dual purpose farms (12.3 %) than dedicated exclusively to the milk (3.3 %) or beef (2.4 %) production. Based on these results and because of the potential negative effects on herd productivity, a chromosomal analysis of breeding animals is recommended as a routine practice, to identify animals carrying the t rob 1;29, mainly in sires.

Keywords : Cattle; Translocation 1;29; Chromosomal aberration.

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