Department of Animal Resource & Science, Dankook University, Cheonan, South Korea.
J Anim Physiol Anim Nutr (Berl). 2021 Nov;105(6):1056-1062. doi: 10.1111/jpn.13537. Epub 2021 Apr 2.
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.
本研究旨在测试在玉米-小麦-豆粕（SBM）基础日粮中添加高剂量米曲霉植酸酶对生长育肥猪（29.73-110.86 公斤活重；70 日龄至 166 日龄）生长性能、养分消化率、粪便气体排放、胴体特性和肉质的影响。总共 56 头杂交猪[(长白猪×约克夏)×杜洛克]被分为两组进行 96 天的试验（生长阶段，0-42 天；育肥阶段，43-96 天），采用完全随机区组设计。每组有 7 个重复栏，每个栏有 4 头猪（2 头公猪和 2 头母猪）。日粮处理包括基于玉米-小麦-SBM 的营养充足基础日粮或基础日粮添加 1500 FTU/kg 米曲霉植酸酶。一个植酸酶单位（FTU）定义为在 37°C 和 pH5.5 下每分钟从植酸盐中催化释放 1 微摩尔磷酸盐所需的酶量。在 0-42 天和 0-96 天期间，生长育肥猪采食高剂量米曲霉植酸酶补充日粮时，平均日增重更高，饲料转化率更低。在日粮中添加高剂量米曲霉植酸酶提高了生长育肥猪第 42 天和第 96 天磷的表观全肠道消化率。此外，采食高剂量米曲霉植酸酶日粮的生长育肥猪背膘厚度高于采食对照日粮的猪。然而，高剂量米曲霉植酸酶添加并未影响粪便气体排放和肉质。总之，日粮中添加高剂量米曲霉植酸酶（1500 FTU/kg）对生长育肥猪的生长性能、磷的表观消化率和胴体背膘厚度有有益影响。
