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将18周近开产母鸡64只随机分成4组(Ⅰ,Ⅱ,Ⅲ,Ⅳ)。用FeSO4·7H2O作添加剂,Ⅰ,Ⅱ,Ⅲ,Ⅳ组日粮每千克分别添加0,50,400,1600mg的铁。饲料本底含铁、铜、锰、锌分别为324.0,14.6,43.9,49.6mg/kg,含钙33.4g/kg,磷4.3g/kg。每千克饲料另添加MnSO4·5H2O0.195g,ZnSO4·7H2O0.220g,CuSO4·H2O0.023g及禽用多维0.14g。预饲后,每间隔28d称重采血1次,并测定其微量元素。结