Chromosomal Analysis of Pure and Crossed Cattle in Norte de Santander, Colombia
Abstract
Proper reproductive management is essential to achieve optimal rates in a cattle produc- tion system. However, there are many causes for decreased fertility, such as genetic causes, which can seriously affect the system. Among these, chromosomal abnormalities cause low fertility, mainly due to unbalanced embryos early death. It is therefore important to diagnose the presence of such anomalies in livestock production units. In order to establish the possible existence of cattle carrying chromosomal abnormalities in farms in Norte de Santander, peripheral blood samples were taken from 31 pure and crossed cattle, belonging to fifteen municipalities in the department. Peripheral blood lymphocyte cultures were performed to obtain chromosomes; 25 cells from each animal were analyzed, in a metaphase, under a conventional light microscope, to determine the chromosomal number and the presence of chromosomal abnormalities. Then, it was established that all of the individuals analyzed presented the normal chromosome number for the species (2n=60) and none presented abnormalities in the karyotype visualized. Likewise, the presence of a Y acrocentric type chromosome in all the males analyzed and a chromosome characteristic of the zebu cattle were evidenced. This result confirms the prevailing racial type in Norte de Santander: Bos taurus x Bos indicus crosses.
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References
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