本试验旨在研究1α羟基维生素D3（1α-OH D3）单独添加及其与植酸酶同时添加对22~42日龄肉鸡生长性能、胫骨发育及肉品质的影响。分2个试验进行，试验1将前期（1~21日龄）采食相同饲粮的21日龄艾拔益加（AA）肉鸡96只随机分为2个处理，每个处理4个重复。设计2种饲粮，试验饲粮是在基础饲粮1（非植酸磷NPP 0.13%，总磷TP 0.35%）中添加5 μg/kg 1α-OH D3。试验2将前期采食相同饲粮的21日龄AA肉鸡240只随机分为5个处理，每个处理4个重复。设计5种饲粮，前4种按2×2正交组合设计，分别在基础饲粮2（NPP 0.20%，TP 0.42%）中添加1α-OH D3 0和5 μg/kg、植酸酶0和500 U/kg；第5种为对照饲粮（NPP 0.35%，TP 0.57%）。结果表明，饲粮中添加1α-OH D3能改善22~42日龄肉鸡胫骨质量，提高血浆磷含量，增加腿肉亮度，降低腿肉剪切力，但未改善肉鸡生长性能。添加植酸酶改善22~42日龄肉鸡生长性能、胫骨质量，降低胸肉黄度和持水力；同时添加1α-OH D3和植酸酶未改善肉鸡生长性能，但二者交互作用可改善胫骨灰分和磷含量。由此可知，1α-OH D3单独添加或与植酸酶同时添加可改善生长肥育阶段肉鸡骨骼发育和肉品质。

This experiment was conducted to evaluate the effects of 1α-OH D3, and interaction between 1α-OH D3 and phytase on growth performance, tibia development, and meat quality of broilers aged from 22 to 42 days. Two trials were conducted in this study. In trial 1, ninety-six Arbor Acres (AA) broilers at 21 days of age with the same diet were allotted to 2 treatments with 4 replicates. Two diets in trail one were the basal diet 1 (NPP 0.13%. TP 0.35%) and the experimental diet, which was the basal diet 1 supplemented with 5 μg/kg of 1α-OH D3. In trial 2, a 2×2 factorial design was conducted to test the effects of supplementing 0 and 5 μg/kg 1α-OH D3 in combination with 0 and 500 U/kg phytase based on the basal diet 2 (NPP 0.20%, TP 0.42%). The fifth diet served as a control (NPP 0.35%, TP 0.57%). The results showed that tibia quality, plasma concentration of inorganic phosphate, and lightness of thigh meat were increased, while shearing force of thigh meat was decreased by dietary supplement with 1α-OH D3, however, dietary supplement with 1α-OH D3 did not significantly affected growth performance of broilers. When phytase was added, growth performance and tibia quality were improved, while yellowness and water-holding capacity of breast meat were declined. Dietary supplement with 1α-OH D3 and phytase did not improve growth performance, but the interaction between 1α-OH D3 and phytase increased the contents of tibia ash and phosphate. In conclusion, the addition of 1α-OH D3 individually or together with phytase improves the quality of bone and meat in broilers aged from 22 to 42 days.［Chinese Journal of Animal Nutrition，2011，23（1）：102-111］