This study tests the effects of supplementation of high-dosing Aspergillus oryzae phytase into the corn–wheat–soybean meal (SBM)-based basal diet on growth performance, nutrient digestibility, faecal gas emission, carcass traits and meat quality in growing-finishing pigs (29.73–110.86 kg live weight; 70-day-old to 166-day-old). A total of 56 crossbred pigs [(Landrace × Yorkshire) × Duroc] were divided into two dietary groups for a 96-day experiment (growing period, days 0–42; finishing period, days 43–96) with a completely randomized block design. There were seven replicate pens in each dietary group, and each pen has four pigs (two barrows and two gilts). The dietary treatments consisted of a corn–wheat–SBM-based nutrient sufficient basal diet or the basal diet supplemented with 1500 FTU/kg A. oryzae phytase. One phytase unit (FTU) was defined as the amount of enzyme that catalyses the release of one micromole phosphate from phytate/min at 37°C and pH 5.5. Higher average daily gain and lower feed conversion ratio were observed in growing-finishing pigs consuming a high-dosing A. oryzae phytase supplementing diet during days 0–42 and 0–96. Supplementing high-dosing A. oryzae phytase to the diet of growing-finishing pigs increased apparent total tract digestibility of phosphorus on days 42 and 96. Moreover, growing-finishing pigs fed the diet supplemented with high-dosing A. oryzae phytase had higher carcass back-fat thickness than those fed the control diet. However, the faecal gas emission and meat quality were not affected by high-dosing A. oryzae phytase supplementation. In conclusion, dietary supplementation of high-dosing A. oryzae phytase (1500 FTU/kg) had beneficial effects on the growth performance, apparent phosphorus digestibility and carcass back-fat thickness in growing-finishing pigs.

中文翻译：

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在玉米-小麦-豆粕基础日粮中添加高剂量米曲霉植酸酶对生长育肥猪生长性能、养分消化率、粪便气体排放、胴体性状和肉质的影响

本研究测试了在以玉米-小麦-豆粕 (SBM) 为基础的基础日粮中添加高剂量米曲霉植酸酶对生长育肥猪生长性能、养分消化率、粪便气体排放、胴体性状和肉质的影响（29.73–110.86 kg 活重；70 日龄至 166 日龄）。共有56个杂交猪[（长×大）×杜洛克]分为膳食组为96天的实验（生长期，天0 - ;在结束期间，天43 42 -用完全随机区组设计96） . 每个日粮组有七个重复围栏，每个围栏有四头猪（两头公猪和两头小母猪）。饮食治疗包括玉米–小麦–基于 SBM 的营养充足的基础日粮或补充 1500 FTU/kg A的基础日粮。 米根植酸酶。一个植酸酶单位 (FTU) 定义为在 37°C 和 pH 5.5 条件下，每分钟催化从植酸盐中释放 1 微摩尔磷酸盐的酶量。在消耗高剂量A 的生长育肥猪中观察到更高的平均日增重和更低的饲料转化率。 在第 0 – 42天和第 0 – 96天补充米粉植酸酶。补充高剂量A . 米科在生长育肥猪日粮中添加植酸酶在第 42 天和第 96 天增加了磷的表观总消化道消化率。此外，生长育肥猪饲喂高剂量A的日粮。 与喂食对照饮食的那些相比，米根植酸酶具有更高的胴体背膘厚度。然而，高剂量A对粪便气体排放和肉质没有影响。 米根植酸酶补充剂。总之，膳食补充高剂量A . 米根植酸酶 (1500 FTU/kg) 对生长育肥猪的生长性能、表观磷消化率和胴体背膘厚度有有益影响。