Absence of 1/29 translocation in Aberdeen Angus breed

DE LUCA J. C.; SISTER P; PRANDO A; BALDO A.; GIOVAMBATTISTA G.

Analecta Veterinaria

Año: 2007 p. 25 - 27

0365-5148

Robertsonian translocations are the most frequent chromosomal aberrations in cattle. The first robertsonian translocation described was the 1/29 translocation. Like other centric fusions, this abnormality reduces fertility as a consequence of genetic excess or deficiency in the germ cells, increasing early embryonic mortality. The incidence of 1/29 translocationin in 89 Aberdeen Angus cattle (38 dams and 51 sires) belonging to 4 farms of the Buenos Aires Province was analyzed, as well as the Y chromosome morphology. Heparinized blood samples were obtained and cultured for cytogenetic analysis. The results obtained showed the absence of the 1/29 translocation in all the animals studied. In all the bulls analyzed Y chromosome morphology was submetacentric. The results obtained in the present work are in concordance with previously results reported for the British beef breeds, like Aberdeen Angus. On the other hand the animals studied did not show fertility reduction, then this could be associated with the absence of the 1/29 translocation. Further studies are needed to assess the entire breed.