Impact of pasture-raised pork farming on genes regulating lipid metabolism and meat quality

Abstract

Studies have shown that pasture-raised pork is fresher and of higher nutritional value than its
conventional counterpart. This study was to determine the effect of grazing systems on meat quality,
carcass traits, and on lipid metabolism gene expressions. Control pigs were fed 100% commercial diet.
Fifty/fifty (50/50) group was placed on 50% of the diet consumed by control group plus free access to
ryegrass-clover pasture. The twenty-five/seventy-five (25/75) group was fed 25% of the diet consumed
by the control plus access to free pasture. The overall meat quality (flavor, overall acceptability and
carcass traits (marbling, color)) were scored significantly higher (P<0.05) in the 25/75 group than in
control or 50/50 group. Back-fat thickness was lower in 25/75 group (P<0.05) than in control and 50/50
group. No differences were observed between the control and 50/50 in meat and carcass qualities. Realtime polymerase chain reaction (PCR) revealed that peroxisome proliferator-activated receptor α
(PPARα), peroxisome proliferator-activated receptor γ (PPARγ), lipoprotein lipase (LPL), and sterolregulatory-element binding protein 2 (SREBP-2) responded differently in muscle and adipose tissues.
The results indicated that pasture-based pork production could positively influence lipid metabolism
genes important in meat and carcass quality traits, with pasture exposure and feed allowance