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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290


BRIDI, Ana Maria et al. Effect of the halothane genes and rearing systems on meat quality of pork. R. Bras. Zootec. [online]. 2003, vol.32, n.6, pp.1362-1370. ISSN 1806-9290.

The effect of halothane genotypes (heterozygous and dominant homozygous) and intensive rearing systems (indoor, wood shavings bedding and outdoor) on pork quality were determinated. Ninety six castrated male pigs were used for the trial. Identification of the halothane genotype was determined in blood samples using the DNA-test, based on the polymerase chain reaction (PCR) amplification of the critical region of the ryanodine receptor and subsequent restricion of the amplifield fragment by the restriction fragment lengh polymorfism (RFLP) technique. The pH at 45 minutes and 24 hours after slaughter was measured on the Longissimus dorsi and Semimembranosus muscles. At the laboratory, the Longissimus dorsi muscle was used for the evaluation of the color, marbling, drip loss, defrosting loss and cooking loss and shear force. The muscle of heterozygous pigs for the halothane gene had lower pH and higher drip loss and the incidence of the PSE condition in this genotype was three times higher. The rearing system did not affect the initial and ultimate pH or water holding capacity. Indoor reared pigs had greater frequency of PSE carcass. The interaction between halothane genotypes and rearing systems had no significant effect on any trait studied.

Keywords : halothane gene; outdoor rearing system; porcine meat quality; PSE; wood shavings bedding.

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