Yan Enfa, Wang Yubo, He Linjuan, Guo Jianxin, Zhang Xin, Yin Jingdong
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
Foods. 2022 Oct 24;11(21):3335. doi: 10.3390/foods11213335.
L-malic acid is a vital intermediate in the citric acid cycle and has been reported to improve the antioxidant capacity and aerobic oxidation of weaned piglets; however, its application in finishing pigs is limited at present. This study explored the effects of dietary L-malic acid supplementation on the carcass traits and meat quality of finishing pigs. In a 45-day experiment, 192 Duroc × Landrace × Yorkshire pigs (75.01 ± 0.51 kg) were divided into four treatments, i.e., a basal diet supplemented with 0, 0.5%, 1%, and 2% L-malic acid complex. The results showed that L-malic acid supplementation had no effects on the growth performance of finishing pigs. Importantly, L-malic acid significantly increased redness (a*) value at 24-h postmortem (quadratic, p < 0.05) and tended to increase the proportion of oxymyoglobin (OMb) (quadratic, p = 0.10), as well as the total antioxidant capacity (T-AOC) activity (quadratic, p = 0.08) in the longissimus dorsi (LD) muscle. Further, dietary supplementation of 1% L-malic acid markedly increased the protein expression level of slow skeletal myosin heavy chain (MyHC) in the LD muscle (p < 0.05). Moreover, 0.5% and 2% L-malic acid supplementation significantly increased carcass length and loin eye area (p < 0.05). In conclusion, dietary L-malic acid could effectively improve the meat color and carcass traits of finishing pigs.
L-苹果酸是柠檬酸循环中的一种重要中间体，据报道它能提高断奶仔猪的抗氧化能力和有氧氧化能力；然而，其目前在育肥猪中的应用有限。本研究探讨了日粮中添加L-苹果酸对育肥猪胴体性状和肉质的影响。在一项为期45天的试验中，192头杜洛克×长白×大白猪（体重75.01±0.51千克）被分为四个处理组，即分别添加0%、0.5%、1%和2% L-苹果酸复合物的基础日粮组。结果表明，添加L-苹果酸对育肥猪的生长性能没有影响。重要的是，添加L-苹果酸显著增加了宰后24小时的肉色红度（a*值）（二次效应，p<0.05），并倾向于增加背最长肌中氧合肌红蛋白（OMb）的比例（二次效应，p = 0.10）以及总抗氧化能力（T-AOC）活性（二次效应，p = 0.08）。此外，日粮中添加1% L-苹果酸显著提高了背最长肌中慢肌肌球蛋白重链（MyHC）的蛋白表达水平（p<0.05）。而且，添加0.5%和2% L-苹果酸显著增加了胴体长度和眼肌面积（p<0.05）。总之，日粮中添加L-苹果酸可有效改善育肥猪的肉色和胴体性状。
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