| This research was intended to use the low calcium and phosphorus levels as foundation to design diet, study the influence from 25-OH-D3 on slaughter performance, meat quality and vitamin D metabolites of 42~63 days-age yellow-feathered broiles. We selected 1200 42-days-age male yellow-feathered broiles, divided into 4 random groups, each group had 5 repeat, each repeat included 60 chicken.25-OH-D3 levels in experimental groups were 0, 50, 70, 90 μg/kg respectively.The results showed that different 25-OH-D3 levels had little influence on 42~63 days-age yellow-feathered broiler's slaughtering performance compared with matched group（P>0.05）;25-OH-D3 could improve the internal organs index, and promote the development of the internal organs, but 90 μg/kg dosage had the tendency of inhibiting peripheral immune organ growth; it certainly improved yellow-feathered broiler's color of meat, water-holding capacity and tenderness, and had little influence on pH （P>0.05）; serum and kidney 1,25-(OH)2-D3 increased significantly (P<0.05),which showed positive correlations with amount of 25-OH-D3, the content of 25-OH-D3 in liver was not significant（P>0.05）. The results indicated that when calcium and phosphate levels in diets were reduced, and 25-OH-D3 added to ration, the growth of internal organ and meat quality had certainly improvement, of which 90 滋g/kg 25-OH-D3 dosage got the best results. |
