Efecto del sistema de producción sobre la asociación de algunos polimorfismos de los genes CAPN, CAST y LEP con su expresión génica y el efecto fenotípico en la producción y calidad de la carne en ganado brahman comercial.
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López Rojas, Luis Ernesto
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Beef livestock in Colombia is mainly based on Bos indicus animals of the brahman breed, adapted to the difficult conditions of the low tropics, characterized by a poor nutritional supply. Although the production characteristics are acceptable, the organoleptic quality of the meat is considered deficient. In addition to the environment, this is related to the genetics of animals, in a specific way, it is known that some allelic variants of the genes
CAPN1, CAST and LEP related to meat of better quality and are in very low frequencies in this breed. In order to assess the effect of the production system on the association of CAPN316, CAPN4751, CAST282, CAST2959, E2FB and E2JW SNP with carcass traits and beef quality of animals of the Brahman cattle, 410 males of this breed from four farms with extensive rotational grazing models in two different production systems, two full-cycle and
two fattening systems were evaluated. In each animal the SNP CAPN316, CAPN4751, CAST282, CAST2959, E2FB and E2JW were genotyped using PCR-HRM and PCR-RFLP, carcass traits, beef nutritional characteristics and their organoleptic attributes were evaluated during 1, 7 and 14 aging days.
The low frequency of alleles associated with organoleptic characteristics of meat was confirmed, in addition the association of these alleles with the production of more tender and juicy meat was verified, however this association is subject to the effects of the environment in which the animals develop. The animals coming from the production system dedicated to the fattening presented meats of better quality, in contrast, in the complete cycle system where the best characteristics of the carcass were obtained. (Tomado de la fuente)
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