本试验旨在研究不同剂量外源肌苷酸对三黄鸡生长性能、肉品质及血清生化指标的影响。选取健康的1日龄三黄肉公鸡1 500只,随机分为5组(各组饲粮中分别添加0、0.05%、0.10%、0.20%、0.30%的肌苷酸),每组6个重复,每个重复50只,试验期52 d。结果表明:1)在肉鸡生长前期(1~36日龄)0.30%肌苷酸组料重比显著低于0.20%肌苷酸组(P<0.05);而整个生长期(1~52日龄),各组生长性能无显著差异(P>0.05)。2)0.20%肌苷酸组胸肌蒸煮损失较对照组降低了21.83%(P<0.05),剪切力降低了16.72%(P>0.05);0.30%肌苷酸组胸肌重显著高于对照组(P<0.05)。与对照组相比,0.20%肌苷酸组胸肌红度(a*)、黄度(b*)值显著提高(P<0.05),而0.10%、0.30%肌苷酸组亮度(L*)值显著降低(P<0.05)。3)52日龄时,0.30%肌苷酸组胸肌肌苷酸含量最高,较对照组提高了38.8%(P<0.05),0.20%肌苷酸组腿肌肌苷酸含量比对照组提高了26.14%(P<0.05)。4)52日龄时,与对照组相比,0.30%肌苷酸组血清中球蛋白含量显著提高(P<0.05),而总蛋白含量、碱性磷酸酶活性有所提高,但差异不显著(P>0.05)。5)36日龄,与对照组相比,0.30%肌苷酸组血清中总胆固醇含量显著降低(P<0.05),同时,0.05%肌苷酸组高密度脂蛋白胆固醇含量提高了38.41%(P<0.05)。以上结果表明,在三黄鸡饲粮中添加外源肌苷酸可降低肉鸡生长前期料重比,改善肌肉颜色,显著提高肌肉肌苷酸的沉积量;另外,外源肌苷酸可提高肉仔鸡血清中总蛋白、球蛋白、高密度脂蛋白胆固醇含量及碱性磷酸酶活性,降低总胆固醇的含量,提高了体内蛋白质及脂质代谢水平;综合生长性能、肉品质及血清生化指标,在三黄鸡饲粮中添加0.30%外源肌苷酸效果最佳。
An experiment was conducted to investigate the effects of exogenous inosinic acid on growth performance, meat quality and serum biochemical indices of broilers. A total of one thousand and five hundred 1-day-old healthy male Sanhuang broilers were allocated to five groups (0, 0.05%, 0.10%, 0.20% and 0.30% dietary inosinic acid supplementation) with 6 replicates per group and 50 birds per replicate, birds were slaughtered on day 52. The results showed as follows: 1) the diets supplemented with 0.30% inosinic acid significantly decreased the feed/gain than that of 0.20% inosinic acid group during the starter period (from 1 to 36 days of age) (P<0.05), but in the whole period (from 1 to 52 days of age), there were no significant differences about growth performance during all groups (P>0.05). 2) Compared with the control group, the cooking loss of the 0.20% inosinic acid group was decreased by 21.83% (P<0.05), the shear force was decreased by 16.72% (P>0.05); the breast muscle weight of 0.30% inosinic acid group was significantly increased (P<0.05). Compared with the control group, the a* and b* values in breast muscle of 0.20% inosinic acid group were significantly increased (P<0.05), meanwhile, the L* value of 0.10% and 0.30% inosinic acid groups was significantly decreased (P<0.05). 3) At the age of 52 days, 0.30% inosinic acid group had the highest inosinic acid content in breast muscle, and it was increased by 38.8% than that of control group (P<0.05); the inosinic acid content in thigh muscle of 0.20% inosinic acid group was increased by 26.14% than that of control group (P<0.05). 4) At the age of 52 days, compared with the control group, serum globulin content of 0.30% inosinic acid group was significantly increased (P<0.05), the total protein content and alkaline phosphatase activity in serum were increased,but there were no significant difference (P>0.05). 5) At the age of 36 days, compared with the control group, the total cholesterol content in serum of 0.30% inosinic acid group was decreased significantly (P<0.05), and the high density lipoprotein cholesterol (HDL-C) content in 0.05% inosinic acid group was increased by 38.41% (P<0.05). The above results suggest that dietary supplementation of exogenous inosinic acid in Sanhuang broilers improve the feed/gain during the starter period and the meat color, and increase the deposition of inosinic acid content; furthermore, exogenous inosinic acid increase the total protein, globulin and HDL-C content, and alkaline phosphatase activity, and decrease the total cholesterol content, therefore, dietary inosinic acid improve the level of protein and lipid metabolism. Taken together the growth performance, meat quality and serum biochemical indices, we recommend the 0.30% exogenous inosinic acid as the best dose in Sanhuang broilers diet.
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