Research is needed to maximize the use of common feed enzymes, phytase and carbohydrase in combination. The objective was to determine effects of 2 phytase doses (PD; 250 [single dose] or 1,500 [super dose] FTU/kg) and 3 carbohydrase enzymes (xylanase [XAN]; mannanase [MAN]; or their combination [XM]) on 0- to 55-d broiler performance and processing (day 45 and 56). Enzymes were applied to a negative control (NC) diet formulated to 95% of breeder recommendations; Ca and available P reduced by 0.145%, and AME by 100 kcal/kg. A positive control diet only differing in AME was also tested, as well as NC alone; results were used for preplanned contrast comparisons. For the factorial, a 0- to 14-d interaction demonstrated optimal feed conversion ratio (FCR) for 1,500 FTU/kg + XM but worst for 250 FTU/kg + XM; feeding XAN regardless of PD brought FCR comparable to 1,500 FTU/kg + XM. Inclusion of MAN resulted in similar 0- to 14-d FCR to 250 FTU/kg + XM. Significant carbohydrase enzyme effects demonstrated maximized 0- to 44-d and 55-d BW and BW gain (BWG) for XAN. Tender yields (day 45) improved with 1,500 FTU/kg PD, but no day-56 PD significance. Foot pad dermatitis scoring was only significant for PD, with increased scores of 1 for 1,500 FTU/kg. Contrasts demonstrated improved day-0 to day-44 BWG and day-45 breast and drumstick weight for XAN + 1,500 FTU/kg vs. NC. Furthermore, feeding 1,500 FTU/kg + XAN increased day-45 scores of 0 and decreased day-56 woody breast scores of 2 when individually compared to NC and positive control. Overall data demonstrate performance/processing benefits for XAN and 1,500 FTU/kg alone and combined.

需要进行研究以最大程度地结合使用常见的饲料酶，植酸酶和糖酶。目的是确定2种植酸酶剂量（PD； 250 [单剂量]或1,500 [超级剂量] FTU / kg）和3种糖酶（木聚糖酶[ XAN ]；甘露聚糖酶[ MAN ]；或其组合[ XM ]）的作用在0至55天的肉鸡生产和加工过程中（第45和56天）。将酶应用于阴性对照（NC）制定了95％饲养员建议的饮食；Ca和有效磷降低0.145％，AME降低100 kcal / kg。还测试了仅在AME上有所不同的阳性对照饮食以及单独的NC。结果用于预先计划的对比。对于阶乘，0到14 d的相互作用表现出1,500 FTU / kg + XM的最佳饲料转化率（FCR），但250 FTU / kg + XM则最差；XPD饲喂XAN的FCR相当于1,500 FTU / kg + XM。包含MAN导致0到14天的FCR接近250 FTU / kg + XM。显着的碳水化合物酶作用显示出0- 44-d和55-d的BW和BW增益最大化（BWG）。招标产量（第45天）以1,500 FTU / kg PD改善，但第56天PD没有显着意义。足垫皮炎评分仅对PD有意义，每1,500 FTU / kg得分增加1。与NC相比，XAN + 1,500 FTU / kg的对比表明，第0天到第44天的BWG以及第45天的乳房和鼓槌的重量有所改善。此外，与NC和阳性对照相比，单独饲喂1,500 FTU / kg + XAN可使第45天的得分提高0，而降低第56天的木质乳房得分2。总体数据表明，单独使用XAN和组合使用，每XAN和1,500 FTU / kg的性能/加工优势。