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Comparison of the meat quality and fatty acid profile of muscles in finishing Xiangcun Black pigs fed varied dietary energy levels
Animal Nutrition ( IF 6.3 ) Pub Date : 2022-06-18 , DOI: 10.1016/j.aninu.2022.06.006
Can Yang 1, 2, 3 , Wenlong Wang 2, 3 , Xiaowu Tang 4 , Ruilin Huang 2 , Fengna Li 2 , Wenxuan Su 2 , Yulong Yin 2, 3 , Chaoyue Wen 2, 5 , Jian Liu 6
Affiliation  

To study the effects of dietary energy level on the meat quality of different muscles in finishing pigs, 400 Xiangcun Black pigs (BW = 79.55 ± 4.77 kg) were randomly assigned to 5 treatments with varied calculated digestive energy (DE) at 3,050, 3,100, 3,150, 3,200 and 3,250 kcal/kg, respectively. Each treatment had 8 replicates with 10 pigs per replicate. Meat quality, amino acid and fatty acid composition were tested in this study. No differences in average daily gain, average daily feed intake or feed-to-gain ratio (P > 0.05) were observed among dietary treatments. Glycogen concentrations of longissimus dorsi (LD) muscle in DE3150 was higher than those in other groups (P < 0.05). The crude fat concentration of biceps femoris (BF) muscle in DE3250 tended to be higher than that in DE3150 and DE3100 groups (P < 0.05). Pigs in DE3250 and DE3200 had higher fiber density and smaller cross-sectional area of BF muscle than those in DE3150 (P < 0.05). Pigs in DE3150 had the highest Cu concentration in LD muscle compared with those in DE3200, DE3250 (P < 0.05). The C16:1 proportion of LD muscle was lower (P < 0.01) and C20:1 was higher (P < 0.05) in DE3050 than that in the other dietary treatments. The C18:3n6 and C20:3n6 proportions of BF muscle in DE3150 were higher than those in DE 3050, DE3200 and DE3250 (P < 0.05). For LD muscle, mRNA expressions of type I and IIa MyHC in group DE3150 were higher than other treatments (P < 0.01). The LD muscle in DE3150 expressed higher PPARd than in other groups (P < 0.01). Pigs in DE3100 expressed higher FOX1 than in DE3200 and DE3250 (P < 0.05). Sterol-regulatory element binding proteins (SREBPa) mRNA expression decreased linearly when dietary energy level increased in BF muscle (P < 0.01). In conclusion, a 200 kcal/kg decrease in digestible energy for 4 consecutive weeks did not affect growth performance of Xiangcun Black pigs. Furthermore, LD and BF muscle respond differently to dietary energy level, and meat quality was improved by the medium energy level during the finishing phase.



中文翻译:

不同日粮能量水平的香村黑猪肥育猪肉质和肌肉脂肪酸分布比较

为研究日粮能量水平对肥育猪不同肌肉肉质的影响,将400头香村黑猪(体重=79.55±4.77 kg)随机分配至5个处理,计算消化能(DE)分别为3,050、3,100、分别为 3,150、3,200 和 3,250 kcal/kg。每个处理有 8 个重复,每个重复 10 头猪。本研究对肉质、氨基酸和脂肪酸组成进行了测试。 日粮处理间平均日增重、平均日采食量或饲料增重比无差异(P > 0.05)。DE3150组背最长肌(LD)的糖原浓度高于其他组(P < 0.05)。DE3250组股二头肌(BF)粗脂肪浓度有高于DE3150组和DE3100组的趋势(P  < 0.05)。与DE3150相比,DE3250和DE3200猪的纤维密度更高,BF肌横截面积更小(P  < 0.05)。与DE3200、DE3250相比,DE3150猪LD肌肉中Cu浓度最高(P  < 0.05)。DE3050的LD肌C16:1比例低于其他日粮处理(P  <0.01),C20:1高于其他日粮处理(P  <0.05)。DE3150 BF 肌 C18:3n6 和 C20:3n6 比例高于 DE 3050、DE3200 和 DE3250 ( P < 0.05)。对于LD肌,DE3150组I型和IIa型MyHC mRNA表达高于其他处理(P  < 0.01)。DE3150 的 LD 肌肉表达的PPARd高于其他组(P  < 0.01)。DE3100 猪的 FOX1 表达高于DE3200和 DE3250(P  < 0.05)。当 BF 肌肉中膳食能量水平升高时,甾醇调节元件结合蛋白 ( SREBPa ) mRNA 表达呈线性下降 ( P < 0.01)。综上所述,连续 4 周消化能降低 200 kcal/kg 不会影响湘村黑猪的生长性能。此外,LD 和 BF 肌肉对日粮能量水平的反应不同,在精加工阶段,中等能量水平改善了肉质。

更新日期:2022-06-18
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