An experiment was conducted to evaluate high doses of phytase associated with multicarbohydrase complex in diets with a nutritional reduction on feed cost, performance, intestinal morphometry, digesta viscosity, blood and bone parameters, and carcass yield of broilers. For this purpose, 1,540 1-day-old male broiler chicks were distributed in a completely randomized design with 5 treatments, with 14 replicates and 22 birds each. The treatments consisted of the following: positive control (PC), a diet meeting the nutritional requirements without enzymes; negative control (NC), a PC diet with a reduction of 100 kcal/kg AME, 0.15% available P, 0.12% Ca, 4% digestible lysine, and 5% Na; NC diet + multicarbohydrase complex (MCC) + phytase at 3 levels (1,000, 1,500, and 2,000 FTU/kg). The results demonstrated that the use of phytase associated with MCC in nutrient-restricted diets maintained broiler performance in the prestarter phase. From 1 to 42 d, broilers fed enzyme-supplemented diets had a better performance than those receiving nutrient-restricted diets without enzymes. The different levels of phytase associated with MCC affected the serum biochemical parameters of broilers; however, these modifications did not influence bone characteristics. The mode of action of enzymes is substrate-dependent, which may have limited enzyme activity. As a result, no improvements in carcass yield or intestinal and bone parameters were observed. It is concluded that diets with nutritional reduction and addition of 1,000 FTU/kg phytase in association with MCC maintain the performance and is a feasible strategy to reduce feed cost.

进行了一项实验，以评估饮食中高剂量的肌醇六磷酸酶与复合糖酶复合物的关系，并从营养上降低了饲料成本，生产性能，肠道形态，消化黏度，血液和骨骼参数以及肉鸡的cas体产量。为此，以完全随机的设计分配了1,540只1天大的雄性肉鸡雏鸡，共进行5次处理，每组14重复，每组22只。治疗方法包括以下几种：阳性对照（PC），一种满足营养要求且无酶的饮食；阴性对照（NC），PC饮食降低100 kcal / kg AME，0.15％有效磷，0.12％Ca，4％可消化赖氨酸和5％Na; NC饮食+多种碳水化合物复合物（MCC）+ 3种水平的植酸酶（1,000、1,500和2,000 FTU / kg）。结果表明，在限制营养的日粮中使用与MCC相关的肌醇六磷酸酶可以在开始前阶段保持肉鸡的生产性能。在1至42 d内，饲喂添加酶的日粮的肉鸡的生产性能要好于未添加酶的限制营养日粮的肉鸡。与MCC相关的植酸酶水平不同会影响肉鸡的血清生化指标。但是，这些修饰并没有影响骨骼特征。酶的作用方式是底物依赖性的，其酶活性可能有限。结果，未观察到car体产量或肠和骨参数的改善。结论是减少营养和添加1的饮食