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育成期水貂不同铜源相对生物学利用率和血清生化指标的研究

DOI: 10.3969/j.issn.1006-267x.2015.02.019

Keywords: 水貂,硫酸铜,碱式氯化铜,蛋氨酸铜,相对生物学利用率,血清生化指标

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Abstract:

本试验旨在研究饲粮不同铜源及水平对育成期水貂血清铜、锌和铁含量及血清氮代谢、脂类和抗氧化指标影响,以及水貂对不同铜源的相对生物学利用率.选择60日龄健康、体重接近的水貂240只,随机分成10组,每组24个重复,每个重复1只貂.试验采用3×3+1试验设计,对照组饲喂基础饲粮,试验组分别在基础饲粮中添加3种铜源(硫酸铜、碱式氯化铜、蛋氨酸铜)和3个铜添加水平(10、25、40mg/kg),预试期7d,正试期45d.结果表明:水貂血清铜含量随饲粮铜添加水平增加呈极显著线性增加(P=0.0004).水貂血清总胆固醇(P=0.0015)、甘油三酯(P=0.0021)和高密度脂蛋白胆固醇(P=0.0101)含量随饲粮铜添加水平增加呈显著或极显著线性降低,然而水貂血清低密度脂蛋白胆固醇含量却未受饲粮铜添加水平的影响(P=0.5790).水貂血清铜蓝蛋白和铜锌超氧化物歧化酶活性均随饲粮铜添加水平增加呈极显著线性升高(P=0.0001).以血清铜蓝蛋白活性为指标,以硫酸铜为参比标准物(100%),碱式氯化铜和蛋氨酸铜的相对生物学利用率分别为109.93%和131.06%.以血清铜锌超氧化物歧化酶活性为指标,以硫酸铜为参比标准物(100%),碱式氯化铜和蛋氨酸铜的相对生物学利用率分别为111.01%和118.10%.由此可见,饲粮添加40mg/kg的铜(基础饲粮铜含量8.05mg/kg)能提高育成期水貂血清抗氧化酶的活性;育成期水貂3组铜源的相对生物学利用率为:蛋氨酸螯合铜>碱式氯化铜>硫酸铜.

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