Growth performance, carcass composition, quality, and enhancement treatment of fresh pork identified through deoxyribonucleic acid marker-assisted selection for the Rendement Napole gene.
Progeny (n = 70) from unrelated, DNA tested, Rendement Napole carrier (RN-/rn+) Hampshire sires, and DNA tested, Rendement Napole normal (rn+/rn+) Yorkshire dams were genotyped for the segregating RN- allele via DNA marker-assisted methodology. Six slaughter groups ensued, with littermates all being represented within the same slaughter group. Boneless pork loins were removed from right carcass sides after a 48-h chill at 2 degrees C. The anterior portions of the loins were not enhanced, whereas the posterior sections were enhanced with a solution containing 0.5% sodium chloride and 0.5% sodium tripolyphosphate to 110% of their initial weight. Carcasses of carrier pigs had less (P < 0.05) 10th rib fat depth and a greater (P < 0.01) percentage carcass lean than carcasses of normal pigs. Postmortem LM pH of carrier pigs was lower (P < 0.002) at 3, 6, 12, and 24 h, and tended to be lower (P = 0.062) at 48 h compared with that of normal animals. Samples of LM from carrier pigs had greater (P < 0.01) glycolytic potential values, drip loss percentages, and a* values, and lower pH values at fabrication than LM from normal pigs. No genotype differences (P > 0.05) were found for LM lactate, L*, or b* values. Nonenhanced semimembranosus samples from carrier pigs exhibited greater (P < 0.05) purge loss percentages and L* values, and lower (P < 0.01) pH values than samples from normal pigs. Enhanced LM samples exhibited greater (P < 0.05) drip and purge loss percentages, greater pH, and lower L* values at fabrication, regardless of Napole status. These findings suggest that the Napole gene has a positive influence on carcass leanness but detrimental effects for lean quality, which were often further compounded when meat was subjected to enhancement treatment.
Department of Animal Science, Oklahoma State University, Stillwater, 74078, USA. cccktb@missouri.edu
C C
CC
Carr
J B
JB
Morgan
E P
EP
Berg
S D
SD
Carter
F K
FK
Ray
D000818:Animals; D001823:Body Composition / Q000235:genetics*; D001947:Breeding; D005260:Female; D005819:Genetic Markers / Q000235:genetics*; D005838:Genotype; D006019:Glycolysis; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid; D008297:Male; D008460:Meat / Q000592:standards*; D012641:Selection, Genetic; D013552:Swine / Q000235:genetics* / Q000254:growth & development*; D014867:Water
D005819:Genetic Markers; D014867:Water; D019344:Lactic Acid