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汞对蛋鸡产蛋性能、蛋品质及血清抗氧化指标的影响

DOI: 10.3969/j.issn.1006-267x.2011.09.020

Keywords: ,产蛋性能,蛋品质,抗氧化,蛋鸡

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Abstract:

本试验旨在研究饲粮汞污染对蛋鸡产蛋性能、蛋品质、血清抗氧化指标的影响以及汞在鸡蛋中的残留情况。选取40周龄巴布考克B300褐壳蛋鸡192羽,随机分成4组:对照组、试验1(T1)组、试验2(T2)组、试验3(T3)组,每组3个重复,每个重复16羽。分别饲喂基础饲粮(汞含量为21.56μg/kg)、基础饲粮+1mg/kg汞(氯化汞,以汞计,下同)、基础饲粮+3mg/kg汞、基础饲粮+9mg/kg汞,试验期9周。结果表明,采食含有不同浓度汞的饲粮9周后,1)T2组平均蛋重显著降低(P<0.05),随着汞添加水平的逐步增加,平均日采食量逐渐下降,但各组差异不显著(P>0.05)。2)各组鸡蛋中总汞含量分别为0.0040、0.0100、0.0266及0.0544mg/kg,各试验组均显著高于对照组(P<0.05),且呈剂量-效应关系。3)T3组蛋壳厚度显著下降,较对照组、T1组和T2组分别低7.5%(P<0.05)、11.9%(P<0.05)和2.6%(P>0.05),呈剂量-效应关系趋势;T3组蛋黄颜色指数低于对照组31.1%(P<0.05);T2组蛋白高度和哈氏单位显著下降(P<0.05)。4)T2组和T3组血清丙二醛含量显著高于对照组(P<0.05),且随着汞添加水平的增加,丙二醛含量显著上升(P<0.05),呈现剂量-效应关系。综上所述,饲料中汞污染可以致使蛋品质下降,并造成汞在鸡蛋中的残留,尤其是当汞添加水平达到9mg/kg时鸡蛋中汞残留量将会超过GB2762—1994相关规定。同时,汞可以导致蛋鸡一定程度脂质过氧化,造成氧化应激。

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