The Porcine Stress Syndrome gene and its relationships with traits of economic importance in swines

Os genótipos do gene PSS foram caracterizados para 596 suínos procedentes de um cruzamento F 2 entre fêmeas comerciais e suínos nativos brasileiros, por meio da técnica de PCR-RFLP. As características de carcaça, desempenho e qualidade da carne foram avaliadas. Entre os 596 animais analisados, 493 (82,72%) foram caracterizados como NN e 103 (17,28%), como Nn. Animais Nn, quando comparados com animais NN, apresentaram, para as características de carcaça, maiores (P0,05) para pH 24 horas após o abate (5,71±0,15 vs. 5,70±0,15), porcentagem de gordura intramuscular (1,55±0,64 vs. 1,65±0,64), força de cisalhamento (5551,60±871,95 vs. 5506,60±871,95), luminosidade (44,96±2,02 vs. 45,01±2,02), índice de vermelho (0,64±0,60 vs. 0,79±0,60), índice de amarelo (6,62±0,55 vs. 6,65±0,55), tonalidade de cor (84,28±5,56 vs. 83,41±5,56) e índice de saturação (6,68±0,52 vs. 6,73±0,52). No entanto, animais Nn, quando comparados com animais NN, apresentaram (P0.05) for pH at 24 hours after slaughter (5.71±0.15 vs. 5.70±0.15), marbling (1.55±0.64 vs. 1.65±0.64), shear force (5551.60±871.95 vs. 5506.60±871.95), lightness (44.96±2.02 vs. 45.01±2.02), redness (0.64±0.60 vs. 0.79±0.60), yellowness (6.62±0.55 vs. 6.65±0.55), hue (84.28±5.56 vs. 83.41±5.56) and chroma (6.68±0.52 vs. 6.73±0.52). However, Nn animals, compared to NN animals, presented lower (P<0.05) pH at 45 minutes after slaughter (6.41±0.26 vs. 6.51±0.26), and higher drip (3.92±1.68 vs. 3.06±1.68), cooking (33.29±2.54 vs. 32.50±2.54) and total (35.67±2.67 vs. 34.01±2.67) water losses. These results show that animals carrying the PSS gene, even those from divergent crossing, generate leaner carcasses, with higher cutting yields and lean content. On the other hand, they produce meat of inferior quality.Coordenação de Aperfeiçoamento de Pessoal de Nível Superio

Relationship between the Porcine Stress Syndrome gene and carcass and performance traits in F2 pigs resulting from divergent crosses

The PSS genotypes of 596 F2 pigs produced by initial mating of Brazilian native boars commercial sows and were characterized by PCR-RFLP and their carcass and performance traits were evaluated. Among the 596 animals analyzed, 493 (82.72%) were characterized as NN and 103 (17.28%) as Nn. With respect to carcass traits, Nn animals presented higher (p < 0.05) right half carcass weight, left half carcass weight, loin depth and loin eye area, and lower shoulder backfat thickness, backfat thickness between last and next to last but one lumbar vertebrae and backfat thickness after last rib at 6.5 cm from the midline compared to NN animals. Nn animals also showed (p < 0.05) higher values for most of the cut yields, indicating higher cutting yields for animals carrying the n allele and lower values for bacon depth, confirming lower fat deposition in carcass. In addition, Nn animals presented (p < 0.05) lower values for the performance trait weight at 105 days of age. These results indicate that animals carrying the PSS gene generate leaner carcasses, higher cut yields, and that the effects of the gene can be observed even in divergent crosses

Relationship between the porcine stress syndrome gene and pork quality traits of F2 pigs resulting from divergent crosses. Genetics and Molecular Biology v.28

Abstract The PSS genotypes of 596 F 2 pigs produced by initial mating of Brazilian native boars commercial sows and were characterized by PCR-RFLP and their carcass and performance traits were evaluated. Among the 596 animals analyzed, 493 (82.72%) were characterized as NN and 103 (17.28%) as Nn. With respect to carcass traits, Nn animals presented higher (p &lt; 0.05) right half carcass weight, left half carcass weight, loin depth and loin eye area, and lower shoulder backfat thickness, backfat thickness between last and next to last but one lumbar vertebrae and backfat thickness after last rib at 6.5 cm from the midline compared to NN animals. Nn animals also showed (p &lt; 0.05) higher values for most of the cut yields, indicating higher cutting yields for animals carrying the n allele and lower values for bacon depth, confirming lower fat deposition in carcass. In addition, Nn animals presented (p &lt; 0.05) lower values for the performance trait weight at 105 days of age. These results indicate that animals carrying the PSS gene generate leaner carcasses, higher cut yields, and that the effects of the gene can be observed even in divergent crosses

Relationship between the Porcine Stress Syndrome gene and pork quality traits of F2 pigs resulting from divergent crosses

The PSS genotypes of 596 F2 pigs produced by initial mating of Brazilian commercial sows and native boars were characterized by PCR-RFLP and the pork quality traits were evaluated. Among the 596 pigs studied, 493 (82.7%) were NN and 103 (17.3%) were Nn. There were no differences between NN and Nn pigs in the following pork qualities: pHu (5.71 ± 0.16 vs 5.70 ± 0.11), intramuscular fat (1.55 ± 0.64% vs 1.65 ± 0.67%), shear force (5552 ± 878 g/1.2 cm vs 5507 ± 826 g/1.2 cm), lightness (44.96 ± 2.05 vs 45.01 ± 1.92), redness (0.64 ± 0.60 vs 0.79 ± 0.55), yellowness (6.62 ± 0.56 vs 6.65 ± 0.48), hue (84.28 ± 5.53 vs 83.41 ± 4.85), or chroma (6.68 ± 0.52 vs 6.73 ± 0.52). However, pork from Nn pigs had a significantly (p < 0.05) lower pH45 (6.41 ± 0.27 vs 6.51 ± 0.26) and greater drip (3.92 ± 1.90% vs 3.06 ± 1.60%), cooking (33.29 ± 2.26% vs 32.50 ± 2.54%) and total (35.67 ± 2.48% vs 34.01 ± 2.58%) loss compared to that of NN pigs. These results indicate that, even in divergent crosses, PSS gene carriers produce pork of poorer quality

Genetic variability among the wild boars (Sus scrofa scrofa), crossbred animals and pigs using microsatellite markers (STRs)

The aim of this work was to study the genetic variability among the wild boars, crossbred animals and pigs using microsatellite markers. Five genetic groups were studied. The fragments of three microsatellites developed for Sus scrofa domestica - IGF1, ACTG2 and TNFB - were amplified through PCR technique to evaluate the expected intra populacion variability (He) and observed (Ho) heterozygosity, and endogamy coefficient (F IS ) within each population and inter population variability F IS , testing relationship among five genetic groups to establish the genetic distance among them. The high level of observed heterozygosity values varied between 0.537 and 0.7871. Generally, F IS was low, suggesting that the endogamy did not exist between the tested animals