To study the effects of 25-hydroxycholecalciferol(25-OH-D3) in ducks,2160 1-d-old Beijing ducks were randomly allocated to 12 treatments,with 6 replicates of 30 ducks per replicate,to investigate the effects of 25-OH-D3(0,35,70 and 105 μg/kg) on live,slaughter performance and bone mineralization in Beijing ducks(1 to 45 d of age)fed basal diets containing three levels of vitamin D3(2 500,3 000 and 3 500 IU/kg).The results showed that there was no effect of 25-OH-D3on average body weight,weight gain,feed intake and feed conversions.The ...