Metabolic responses of cholecalciferol (VD3) and minerals (Ca, P and Mg) in abalone Haliotis discus hannai Ino to dietary VD3 and phosphorus (P) were investigated. Based on a 2 x 2 factorial design, four casein-gelatin-based diets were formulated. The basal diet was supplemented with either 0 or 2000 IU VD3/kg diet and 0 or 10 g P/kg diet. The abalone was reared in P-free artificial seawater for 55 days. Results showed that dietary VD3 was hydroxylated to 25-hydroxyvitamin D3 [25(OH)D3] and 1α,25-dihydroxyvitamin D3 [1α,25(OH)2D3] in abalone, and subsequently raised the serum levels of these two VD3 metabolites. Dietary P deficiency elevated serum 1α,25(OH)2D3 level only when the dietary VD3 supplementation was sufficient. The supplementations of either dietary VD3 or P significantly increased the levels of P in serum, mantle and hepatopancreas, and only the addition of VD3 significantly raised the concentrations of Ca in serum and mantle (P<0.05). Interaction between dietary VD3 and P was only found significant on the concentrations of P and Mg in mantle (P<0.05). The concentrations of Ca, P and Mg in muscle were not significantly influenced by these dietary treatments. Hence, the metabolic responses in serum, muscle, mantle and hepatopancreas of abalone to dietary VD3 and P were in different manners.
|Number of pages||8|
|Journal||Journal of Experimental Zoology Part A: Comparative Experimental Biology|
|State||Published - Oct 1 2003|