Cinnamic acid (CA) is a natural bioactive substance with antimicrobial, anti-inflammatory and antioxidant properties, which has potential value as a novel feed additive. This study investigated the effects of CA supplementation on growth performance, carcass characteristics, meat quality, energy metabolism and antioxidant capacity in muscle of Yuedong black pigs. A total of 100 3-month-old Yuedong black pigs with an initial body weight of 35 kg were selected and randomly assigned to two treatment groups: the control group and the 0.3 g/kg CA group, with 50 pigs in each group. Compared with control group (CON), dietary supplementation of CA increased average daily gain (ADG) (P < 0.05), while tended to decrease feed conversion ratio (FCR) (P = 0.056). Furthermore, dietary supplementation of CA improved the marbling score, and increased cross-sectional area of muscle fiber of the longissimus thoracis (LT) (P < 0.05). Importantly, CA supplementation promoted muscle hypertrophy by increasing myosin heavy chain (MyHC) expression and protein deposition. The myofiber types were unchanged between control and CA group. CA group showed reduced serum glucose, promoted mitochondrial synthesis and increased lactic acid and ATP content in muscle (P < 0.05). Additionally, CA increased the expression of antioxidant genes (glutathione peroxidase 1, Gpx1 and peroxiredoxin 1, Prdx1) in muscle, but no significant difference was observed in malondialdehyde (MDA) levels, total antioxidant capacity (T-AOC) and glutathione peroxidase (GPX) activity in serum. Overall, CA could improve growth rate, meat quality, and promote muscle development, energy metabolism and antioxidant capacity of Yuedong black pigs.
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