日粮Zn、Mn、Cu、Fe含量对产蛋鸡微量元素表观利用率和鸡蛋品质的影响

将19周龄罗曼褐壳蛋鸡525只,随机分为5个处理,每处理7个重复,每重复15只鸡,试验持续14周。处理A为对照组,不添加微量元素;处理B,基础日粮添加Zn 28.7 mg/kg;处理C,基础日粮添加Zn63.7、Mn 30.0和Cu 2.5 mg/kg;处理D,基础日粮添加Zn 98.7、Mn 60.0和Cu 6.5 mg/kg;处理E,基础日粮添加Zn 17.0、Mn 14.7、Cu 2.0和Fe 30.0 mg/kg。研究微量元素添加量对微量元素表观利用率和鸡蛋品质的影响。结果表明,排泄物中微量元素含量随日粮含量升高而显著升高,Zn、Cu、Fe的表观利用率各处理间差异不显著(P>0.05);日粮Mn含量显著影响Mn利用率(P<0.05)。日粮Zn、Mn、Cu、Fe含量显著影响蛋黄胆固醇浓度和去壳全蛋Zn、Mn、Cu、Fe含量(P<0.05)。蛋黄颜色各处理间差异均不显著(P>0.05)。综合考虑,基础日粮添加Zn 28.8 mg/kg可显著改善鸡蛋品质。

The Effect of Dietary Contents of Zn,Mn,Cu and Fe on Apparent Availability of Trace Mineral and Egg Quality of Laying Hens

An experiment was conducted to evaluate the effect of dietary content and combinations of Zn,Mn,Cu and Fe on apparent availability of these elements and egg quality.The experiment comprised 525 19-week-old Lohmann Brown laying hens in 5 groups for 14 weeks. The basal diet contained Zn,Mn,Cu and Fe at 76.3,90.0,13.5 and 868.8 mg/kg,respectively.The experimental diets were supplemented with trace minerals(inorganic forms) at different levels:(a) the control group without trace mineral supplementation,and basal diet supplemented with(b) 28.7 mg/kg of Zn,(c) 63.7 mg/kg of Zn,30.0 mg/kg of Mn and 2.5 mg/kg of Cu,(d) 98.7 mg/kg of Zn,60.0 mg/kg of Mn and 6.5 mg/kg of Cu,(e) 17.0 mg/kg of Zn,14.7 mg/kg of Mn,2.0 mg/kg of Cu and 30.0 mg/kg of Fe.In conclusion,the contents of Zn,Mn,Cu and Fe in excreta were related to their dietary content.The apparent availability of Zn,Cu,Fe were not effected by dietary contents of Zn,Cu,Fe(P>0.05).The apparent availability of Mn was effected by dietary content of Mn (P<0.05).The concentrations of egg yolk cholesterol were effected by dietary contents of Zn,Mn,Cu and Fe(P<(0.01)).The contents of Zn,Mn,Cu and Fe in egg were effected by dietary contents of Zn,Mn,Cu and Fe.The yolk color was not different among groups(P>(0.05)).