Abstract: This experiment was conducted to study the effect of vitamin D3 levels on body composition,concentration of calcium and phosphorus and activity of alkaline phosphatase(ALP) in the serum of juvenile mirror carp(C.carpio Songpu mirror carp.),to determine the best dietary vitamin D3 level of juvenile carp.525 juvenile mirror carps,weighting an average of 2.4 g were randomly assigned to seven dietary treatments with three replicates and 25 carps with each pen.Seven levels of vitamin D3(0,200,400,800,1 600,3 200 and 1×105 IU/kg) of the dietary were fed to seven groups.The feeding trial lasted for 56 days.The results showed that moisture,crude protein,crude lipid contents of the body and concentration of phosphorus in the serum were not significantly affected by vitamin D3(P0.05).The crude ash,calcium and phosphorus contents of the body,concentration of calcium and activity of ALP in the serum were significantly affected by vitamin D3(P0.05),compared to the experimental group which without vitamin D3.Calcium and phosphorus contents of the body,concentration of calcium and phosphorus and activity of ALP in the serum were increased and then decreased with increasing of dietary vitamin D3 supplementation.These results indicated that the calcium and phosphorus contents of the body,concentration of calcium and activity of ALP in the serum was significantly increased by suitable vitamin D3 level,compared with no or excessive vitamin D3 level.The suitable requirement of juvenile mirror carp is about 708.3-769.8 IU/kg diet,based on establishing indexes line model to calculate the calcium,phosphorus contents of the body and ALP activity of mirror carp in the serum.

Key words: Vitamin, D3, Mirror carp, Body composition, ALP

CLC Number: 

• S965