本试验旨在研究不同无机磷源对断奶仔猪钙、磷表观消化率及钙、磷代谢的影响。试验选取200头遗传背景一致、健康状况良好、初始体重为（8.41±0.97）kg的（28±2）日龄的长×大断奶仔猪，随机分成5个组，每个组4个重复，每个重复10头仔猪（公母各占1/2）。5组仔猪分别饲喂含0.66%粉状磷酸氢钙（DCP）、0.44%粒状磷酸二氢钙（MCP）、0.44%粉状MCP、0.49%粉状磷酸一二氢钙（MDCP）、0.49%粒状MDCP的饲粮，并保持饲粮钙、磷水平一致。试验期28 d。结果显示：1）各组仔猪的钙和干物质表观消化率差异不显著（P>0.05），粉状MDCP组仔猪的磷表观消化率显著高于粉状DCP、粒状MCP和粉状MCP组（P<0.05），但与粒状MDCP组差异不显著（P>0.05）；2）仔猪血清钙、磷含量各组之间差异不显著（P>0.05），但粉状MCP组仔猪血清碱性磷酸酶活性显著低于其他组（P<0.05）；3）蹄骨重、蹄骨灰分重、蹄骨灰分率及蹄骨磷含量各组之间差异不显著（P>0.05），但粉状MDCP、粉状MCP以及粒状MCP组蹄骨钙含量显著高于粉状DCP组（P<0.05）。由此可知，相较于粉状DCP，粉状MDCP、粒状MDCP、粒状MCP和粉状MCP均能较好地促进断奶仔猪钙、磷的代谢和利用，是替代粉状DCP的良好磷源。

This experiment was conducted to study the effects of different inorganic phosphorus sources on apparent digestibility and metabolism of calcium and phosphorus of weaned piglets. Two hundred weaned piglets at the age of (28±2) days with similar genetic background, good health status and body weight of (8.41±0.97) kg were randomly divided into 5 groups with 4 replicates of 10 piglets (half male and half female) per replicate. The piglets in the 5 groups were fed diets supplemented with 0.66% powdery dibasic calcium phosphate (DCP), 0.44% powdery mono-calcium phosphate (MCP), 0.44% granular MCP, 0.49% powdery mono-calcium and di-calcium phosphate (MDCP) or 0.49% granular MDCP, respectively. Five group diets keep a same level of calcium and phosphorus. The whole experiment lasted for 28 days. The results showed as follows:1) the apparent digestibility of calcium and the dry matter had no significant difference among groups (P>0.05). The apparent digestibility of phosphorus of powdery MDCP group was significantly higher than that of powdery DCP, powdery MCP and granular MCP groups (P<0.05), but no significant difference was found between powdery MDCP and granular MDCP groups (P>0.05). 2) There were no significant differences in the contents of serum calcium and phosphorus among groups (P>0.05). But compared with the other groups, the serum alkaline phosphatase activity of powdery MCP group was significantly reduced (P<0.05). 3) There were no significant differences in the coffin bone weight, coffin bone ash weight, coffin bone ash ratio and coffin bone phosphorus content among groups (P>0.05). However, the coffin bone calcium content of powdery MDCP, powdery MCP and granular MCP groups was significantly higher than that of powdery DCP group (P<0.05). In conclusion, compares with powdery DCP, powdery MDCP, powdery MCP, granular MDCP and granular MCP can improve the metabolism and utilization of calcium and phosphorus, all of them are good inorganic phosphorus sources to substitute powdery DCP.