This study aimed to evaluate 2 phytases, at 2 supplementation doses, in broiler diets with nutritional matrices with reduction in Ca:total P (tP) ratio. One-day-old male chicks (n = 3,960) were distributed in an arrangement of 12 treatments, with 10 replicates each; the experimental unit consisted of a floor pen with 33 birds each. Trial lasted up to 42 D, and birds were given the experimental diets: T1—positive control 1 (high Ca:tP ratio—recommended amount); T2—negative control 1 (reduction of 0.16% Ca and 0.16% available P-AP); T3–T2 + 500 FTU/kg enzyme A; T4–T2 + 500 FTU/kg enzyme B; T5–T2 + 1000 FTU/kg enzyme A; T6–T2 + 1000 FTU/kg enzyme B; T7–positive control 2 (low Ca:tP ratio); T8—negative control 2 (reduction of 0.16% Ca and 0.16% AP); T9–T8 + 500 FTU/kg enzyme A; T10–T8 + 500 FTU/kg enzyme B; T11–T8 + 1000 FTU/kg enzyme A; and T12–T8 + 1000 FTU/kg enzyme B. At 21 and 42 D of age, performance variables were recorded (body weight, body weight gain, feed intake, and feed conversion ratio) and tibial bone composition (Ca and P) and resistance was determined (strength at rupture). Results indicate that enzyme supplementation was efficient, regardless of Ca:tP ratio. The highest phytase dose presented superior results, especially for the 21-D evaluation. Phytase “B,” a bacterial product, showed superior response on performance and bone quality.

这项研究旨在评估补充营养的肉鸡日粮中添加2种补充剂量的2种植酸酶，其中Ca：total P（tP）比率。将一天大的雄性小鸡（n = 3,960）分配为12种处理，每组10个重复；实验单元由一支有33只鸟的落地笔组成。试验持续至42 D，并给家禽提供实验饮食：T1-阳性对照1（高Ca：tP比-推荐量）；T2-阴性对照1（减少0.16％的Ca和0.16％的可用P-AP）；T3-T2 + 500 FTU / kg酶A；T4-T2 + 500 FTU / kg酶B; T5-T2 + 1000 FTU / kg酶A; T6-T2 + 1000 FTU / kg酶B；T7阳性对照2（低Ca：tP比）；T8-阴性对照2（减少0.16％的Ca和0.16％的AP）；T9–T8 + 500 FTU / kg酶A；T10–T8 + 500 FTU / kg酶B；T11–T8 + 1000 FTU / kg酶A；和T12–T8 + 1000 FTU / kg酶B。分别在21和42 D年龄记录了性能变量（体重，体重增加，饲料摄入，Ca和P）和抗性被确定（断裂强度）。结果表明，无论Ca：tP比如何，酶补充都是有效的。最高肌醇六磷酸酶剂量表现出优异的结果，尤其是对于21-D评估。植酸酶“ B”是一种细菌产品，对性能和骨骼质量显示出优异的响应。