1/29 Robertsonian translocation in Blonde d'Aquitaine bulls: frequency and effects on semen characteristics

Analysis of chromosome and karyotype in Bali cattle and Simmental-Bali (Simbal) crossbreed cattle

Chromosome analysis is very important part for the initial analysis of genetics. Some genetics abnormalities can be detected at the chromosome level and are usually associated with the inherited diseases. Accurate and prompt information need to be obtained for the purposes of the prevention of the genetics abnormalities genetics risk. This study was aimed to find out and to analyze the different size and morphological chromosome of Bali cattle and its crosses with Simmental cattle (Simbal cattle). Ten Simbal cattle (5 male and 5 female) and 5 female Bali cattle were used in this study. Five milliliter blood was collected using venous puncture through the jugular vein of each cattle. Chromosome was derived from white blood cells (lymphocyte) of peripheral blood. The Bali cattle and Simbal cattle have diploid chromosome (2n) of 60, with 29 pair of autosomes and one pair of sex chromosome. All autosomes are acrocentric with centromere index of 25.13 to 29.52% for Simbal cattle and 21.61 to 24.84% for Bali cattle. Sex chromosomes ware sub-metacentric in Simbal cattle either male or female and metacentric in female Bali cattle. Average length of chromosomes of female Simbal, male Simbal and female Bali cattle were 0.29 +/- 0.04 micron, 0.30 +/- 0.05 micron and 0.24 +/- 0.02 micron, respectively. Chromosome size of female Bali cattle was smaller than Simbal cattle.

1/25 translocations in Blonde d'Aquitaine cattle in New Zealand

A Robertsonian centric fusion between chromosomes 1 and 25 in Blonde d'Aquitaine cattle in New Zealand is reported. This fused chromosome is the same as the widely reported 1/29 translocation chromosome with the difference in the numbering arising from inconsistencies in the G and R-banded cattle karyotypes of the International System for Cytogenetic Nomenclature of Domestic Animals, 1989.

Does the Robertsonian translocation affect the fertility of Blonde d'Aquitaine breed bulls?

The effects of the 1/29 translocation upon male fertility were studied by analysis of the results of 1,350,385 first artificial inseminations with the semen of Blonde d'Aquitaine or Coopelso-93 bulls (n=220). A binomial logit model was designed, taking into account the translocation of sire, breed of sire, breed of dam, year, AI center, and all interactions between translocation, and breed of sire, and breed of dam. Male fertility was not affected by the 1/29 translocation, and the nonreturn rates at 60 to 90 days of Blonde d'Aquitaine females inseminated with the semen of carrier bulls (135,632 first AI) or noncarrier bulls (585,949 first AI) were 74.88% and 74.75%, respectively.