Dersjant-Li Yueming, Davin Roger, Christensen Trine, Kwakernaak Cees
Danisco Animal Nutrition (IFF), Leiden, The Netherlands.
Schothorst Feed Research, Lelystad, The Netherlands.
PLoS One. 2021 Mar 25;16(3):e0247420. doi: 10.1371/journal.pone.0247420. eCollection 2021.
The effect of two microbial phytases at two dose-levels on performance and apparent ileal digestibility (AID) of nutrients in broilers fed European-type diets was studied. A total of 1,200 d-old Ross 308 male broilers were randomly assigned to 5 treatments with 30 birds/pen and 8 pens/treatment. A nutritionally adequate positive control (PC) diet was tested against 4 experimental diets containing reduced total P, retainable P, Ca and Na as per the recommended nutritional contribution for Buttiauxella phytase (Phy B) at 1,000 FTU/kg (-1.87 g/kg, -1.59 g/kg, -1.99 g/kg and -0.4 g/kg vs. PC, respectively). Experimental diets were supplemented with Phy B at 500 FTU/kg or 1,000 FTU/kg, or Citrobacter phytase (Phy C) at 1,000 FTU/kg or 2,000 FTU/kg. Diets were based on corn, soybean meal, rapeseed meal and sunflower meal and formulated by phase (starter 1-10 d, grower 11-21 d) in crumbled or pelleted form. Overall (d 1-21), at 1,000 FTU/kg, birds fed Phy C exhibited lower BWG (-2.7%), FI (-3.4%) and tibia ash (-2.2%) vs. PC (P < 0.05), and reduced BWG (-3.6%), FI (-3.9%) and tibia ash (-1.8%) vs. Phy B (P < 0.05). Phy B at 1,000 FTU/kg and Phy C at 2,000 FTU/kg maintained performance equivalent to the PC. Digestibility of Ca did not differ among phytase treatments but at 1,000 FTU/kg AID P was greater with Phy B than Phy C (72.3% vs. 62.7%, P < 0.05). Ileal phytate (myo-inositol hexakisphosphate, IP6) digestibility was greatest with Phy B at 1,000 FTU/kg which was higher than Phy C at 1,000 FTU/kg (87.6 vs. 60.6%, P < 0.05). The findings indicate a higher phytate degradation rate of Phy B than Phy C at equivalent dose-level and this is correlated to the performance of the broilers.
研究了两种微生物植酸酶在两个剂量水平对饲喂欧式日粮的肉鸡生产性能和养分表观回肠消化率（AID）的影响。总共1200只1日龄罗斯308雄性肉鸡被随机分配到5种处理中，每栏30只鸡，每种处理8栏。将营养充足的阳性对照（PC）日粮与4种试验日粮进行对比，这4种试验日粮按照推荐的Butiauxella植酸酶（植酸酶B）营养贡献量，分别降低了总磷、可留存磷、钙和钠的含量（与PC相比分别降低-1.87 g/kg、-1.59 g/kg、-1.99 g/kg和-0.4 g/kg）。试验日粮添加了500 FTU/kg或1000 FTU/kg的植酸酶B，或1000 FTU/kg或2000 FTU/kg的柠檬酸杆菌植酸酶（植酸酶C）。日粮以玉米、豆粕、菜粕和葵花粕为基础，按阶段（1 - 10日龄雏鸡料，11 - 21日龄生长鸡料）制成破碎料或颗粒料。总体而言（1 - 21日龄），在1000 FTU/kg剂量下，与PC相比，饲喂植酸酶C的肉鸡体重增长（BWG）降低（-2.7%）、采食量（FI）降低（-3.4%）、胫骨灰分降低（-2.2%）（P < 0.05）；与植酸酶B相比，体重增长降低（-3.6%）、采食量降低（-3.9%）、胫骨灰分降低（-1.8%）（P < 0.05）。1000 FTU/kg的植酸酶B和2000 FTU/kg的植酸酶C维持了与PC相当的生产性能。植酸酶处理之间钙的消化率没有差异，但在1000 FTU/kg时，植酸酶B的有效磷消化率高于植酸酶C（72.3%对62.7%，P < 0.05）。1000 FTU/kg的植酸酶B的回肠植酸盐（肌醇六磷酸，IP6）消化率最高，高于1000 FTU/kg的植酸酶C（87.6%对60.6%，P < 0.05）。研究结果表明，在同等剂量水平下，植酸酶B的植酸盐降解率高于植酸酶C，这与肉鸡的生产性能相关。
