Address：Feed Research Institute Chinese Academy of Agricultural sciences

Time： 42days

Objective：to discuss RBV of different phosphorus sources in meat ducks

Phosphorus supplemental level of RBV design： early experiment （1-21d） 0.075%、0.150%、0.225%、0.300% and 0.375%, late experiment（21-42d） 0.12%、0.18%、0.24%、0.30%, The phosphorus sources are DCP (standard phosphorus source) and MDCP.

Conclusions: According to the results of RBV experiment result, RBV of MDCP is higher than that of DCP in body weight, calcium and phosphorus level of tibia. The overall RBV is 10% higher than that of DCP.