Effects Of Dietary Vitamin D Supplementation Level On Growth Performance, Ca、Pmetabolism, Serum Indices, Immune And Antioxidant Function Of Growing Rex Rabbits

The experiment was conducted to investigate the affects with one factor at five dietary Vitamin D Supplementation level on growth performance, Ca、P metabolism, serum indices, immune and antioxidant function of growing Rex rabbits.Rabbit in the5groups were fed experimental diets containing0,500IU/kg,1000IU/kg,2000IU/kg and4000IU/kg Vitamin D,respectively.Flowing are results of the experiment:Two hundred3-month-old Rex rabbit with an average body weight of (1446±34)g were randomly assigned to5groups with40replicates in each group and each replicate contained1rabbit.There was a pretrial period of7days followed by an experimental period of53days.The results showed as follows:dietary Vitamin D Supplementation level did not significantly affect average daily intake (ADI),average daily gain (ADG) and feed/gain (F/G)(P>0.05),and did not significantly affect the weight,area,thickness and length of the fur (P>0.05),and did not significantly affect the brightness,red yellow degree of the meat (P>0.05).Dietary Vitamin D did not significantly affect serum Ca, P content, P content in the fecal sample (P>0.05),but had significant influence on Ca content in the fecal sample (P=0.0115).Dietary Vitamin D did not significantly affect apparent digestibility of Ca,P (P>0.05),but with the increase of VD Supplementation level,the apparent digestibility of Ca,P showed a trend of rise before they are reduced.Dietary Vitamin D did not significantly affect the weight and length of the shin (P>0.05), but had significant influence on the volume of shin (P=0.0100),weight/volume (P=0.0023) and Ca content (P=0.0022).Dietary Vitamin D had significant influence on serum TP (P=0.0463) and ALB (P=0.0430),but did not significantly affect serum ALP,TQCHO,HDL and LDL (P>0.05).Dietary Vitamin D had significant influence on serumCT (P=0.0104) and VD3(P=0.0175),but did not significantly affect serum PTH (P>0.05).Dietary Vitamin D had significant influence on the spleen index (P=0.0242),but did not significantly affect the thymus index (P>0.05) and IL-2(P>0.05), had significant influence on IgA (P=0.0001),IgG (P<0.0001),IgM (P=0.0095).Dietary Vitamin D had significant influence on serum GSH-Px (P=0.0078),T-SOD (P＜0.0001),liver GSH-Px (P=0.0048) and T-SOD (P=0.0430),but did not significantly affect serum MDA,liver AOC and MDA(P>0.05). Considering all indices of this experiment,the results showed as followsthe appropriate Vitamin D Supplementation level in the diet of growing Rex rabbit is2000IU/kg.