中文摘要：

本试验旨在研究饲粮中添加不同水平维生素D3（VD3）对肉仔鸡生长性能及骨磷代谢利用的影响。试验选用480只1日龄艾拔益加肉公雏，采用2×4双因子完全随机设计，设2个饲粮非植酸磷水平[0.45%和0.23%（实测值为0.44%和0.21%）]与4个VD3添加水平（0、1 000、2 000和4 000 IU/kg），共8个组，每组6个重复，每个重复10只鸡。试验期21 d。结果表明，与0.21%非植酸磷水平相比，0.44%非植酸磷水平显著提高肉仔鸡平均日增重（ADG）、平均日采食量（ADFI）、胫骨灰分含量和胫骨灰分磷含量（P〈0.05），显著降低料重比（F/G）和胫骨灰分磷绝对沉积率（P〈0.05）；与不添加VD3相比，饲粮中添加VD3显著提高肉仔鸡ADG、15~21和1~21日龄ADFI、胫骨灰分含量和胫骨灰分磷绝对沉积率（P〈0.05），显著降低1~21日龄肉仔鸡F/G（P〈0.05）；0.21%非植酸磷水平下，与不添加VD3相比，饲粮中添加VD3显著降低肉仔鸡死亡率（P〈0.05），显著提高21日龄肉仔鸡胫骨灰分磷重量（P〈0.05），添加2 000 IU/kg VD3显著提高14日龄肉仔鸡胫骨灰分磷重量（P〈0.05）；0.44%非植酸磷水平下，与不添加VD3相比，饲粮中添加VD3显著提高肉仔鸡胫骨灰分磷重量（P〈0.05）。以上结果表明，饲粮中添加VD3可提高肉仔鸡的生长性能并降低死亡率，促进磷在骨骼中的代谢利用。

英文摘要：

This experiment was conducted to investigate the effects of different dietary vitamin D3 （VD3） levels on growth performance and bone phosphorus metabolic utilization of broilers. A completely randomized factorial design involved two non-phytate phosphorus （NPP） contents[0.45% and 0.23% （the measured content was 0.44% and 0.21%, respectively）] and four VD3 supplemental levels （0, 1 000, 2 000, and 4 000 IU/kg）. A total of 480 one-day-old Arbor Acres male broilers were allotted to 8 groups with 6 replicate cages of 10 broilers per cage for each group. The experiment lasted for 21 days. The results showed that the broilers fed diets containing 0.44% NPP had significantly higher average daily gain （ADG）, average daily feed intake （ADFI）, tibia ash content and its phosphorus content （P〈0.05）, while had significantly lower ratio of feed to gain （F/G） and tibia ash phosphorus absolute deposition rate （P〈0.05） compared with the broilers fed diets containing 0.21% NPP. Dietary VD3 significantly enhanced ADG, ADFI during 15 to 21 days of age and 1 to 21 days of age, tibia ash content and its phosphorus absolute deposition rate of broilers （P〈0.05）, significantly decreased the F/G of broilers during 1 to 21 days of age （P〈0.05） compared to the diet without addition of VD3. When the broilers fed diets containing 0.21% NPP, dietary VD3 significantly decreased the mortality of broilers （P〈0.05）, and significantly promoted tibia ash phosphorous weight of broilers at 21 days of age （P〈0.05）, while dietary 2 000 IU/kg VD3 significantly promoted tibia ash phosphorous weight of broilers at 14 days of age （P〈0.05） compared to the diet without addition of VD3. When the broilers fed diets containing 0.44% NPP, dietary VD3 significantly enhanced tibia ash phosphorous weight of broilers compared to the diet without addition of VD3 （P〈0.05）. The results indicate that dietary VD3 can enhance the growth performance and decrease the mortality and promoted phosphorus