This study aimed to determine the optimal supplemental level of bacterial 6-phytase (CJ BIO, Korea) based on bone parameters, nutrient digestibility, and growth performance of nursery pigs. Seventy-two weaned pigs (5.8 ± 0.5 kg BW) were allotted to 6 treatments based on RCBD with initial BW and sex as blocks and fed in 3 phases (P1/P2/P3 for 14/10/14 d, respectively). The treatments consisted of a negative control diet without phytase formulated meeting requirements of NRC, (2012). The other 5 treatments were a basal diet formulated with 0.12% Ca and P deficient with increased supplemental phytase (0, 500, 1,000, 2,000, and 5,000 FTU/kg feed). Titanium dioxide (0.4%) was added to P3 diets as an indigestible marker to measure AID of nutrients. On d 45, all pigs were euthanized to collect ileal digesta to measure AID, and third metacarpus to measure bone parameters. Data were analyzed using SAS 9.4. The supplementation of phytase from 0 to 950 FTU/kg feed increased (P < 0.05) the ADG (0.32 to 0.40 kg/d). Increasing phytase supplementation from 0 to 5,000 FTU/kg increased (linear, P < 0.05) AID of CP (76.8 to 79.5%), P content (4.6 to 5.2% of DM) and ash content (26.2 to 28.8%). The supplementation of phytase from 0 to 950 FTU/kg feed increased (P < 0.05) P content (17.6 to 18.1% of ash) and from 0 to 1,900 FTU/kg feed increased (P < 0.05) bone breaking strength (222 to 329 N). Phytase supplementation (0 vs. 1,000 to 5,000 FTU/kg) increased (P < 0.05) AID of EE (65 to 73%), and P (79 to 84%). In conclusion, phytase supplementation improved bone breaking strength, bone ash and P content, nutrient digestibility, and growth performance. The supplementation of phytase between 950 and 1,900 FTU/kg feed provided the most benefits for growth performance, bone parameters, and nutrient digestibility.

中文翻译：

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93 细菌 6-植酸酶及其最佳补充水平对保育猪骨骼参数、营养消化率和生长性能的功效

本研究旨在根据保育猪的骨骼参数、养分消化率和生长性能确定细菌 6-植酸酶（CJ BIO，韩国）的最佳补充水平。72 头断奶仔猪 (5.8 ± 0.5 kg BW) 被分配到基于 RCBD 的 6 个处理中，初始 BW 和性别为块，并分 3 个阶段喂养（分别为 14/10/14 天的 P1/P2/P3）。处理包括没有植酸酶的阴性对照饮食，配方符合 NRC (2012) 的要求。其他 5 个处理是基础日粮，其中 0.12% Ca 和 P 缺乏并增加了补充植酸酶（0、500、1,000、2,000 和 5,000 FTU/kg 饲料）。在 P3 日粮中添加二氧化钛 (0.4%) 作为难消化标记，以测量营养物质的 AID。在第 45 天，对所有猪实施安乐死以收集回肠食糜以测量 AID，和第三掌骨测量骨骼参数。使用 SAS 9.4 分析数据。从 0 到 950 FTU/kg 饲料添加植酸酶增加了（P < 0.05）ADG（0.32 到 0.40 kg/d）。将植酸酶添加量从 0 增加到 5,000 FTU/kg 会增加（线性，P < 0.05）CP（76.8 到 79.5%）、P 含量（干物质的 4.6 到 5.2%）和灰分含量（26.2 到 28.8%）的 AID。添加植酸酶从 0 到 950 FTU/kg 饲料增加（P < 0.05）P 含量（灰分的 17.6 到 18.1%），从 0 到 1,900 FTU/kg 饲料增加（P < 0.05）骨断裂强度（222至 329 N)。植酸酶补充剂（0 对 1,000 至 5,000 FTU/kg）增加了（P < 0.05）EE（65 至 73%）和 P（79 至 84%）的 AID。总之，植酸酶补充剂改善了骨断裂强度、骨灰分和 P 含量、养分消化率、和成长业绩。在 950 和 1,900 FTU/kg 饲料之间添加植酸酶对生长性能、骨骼参数和养分消化率有最大的好处。