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饲粮阴阳离子差对围产期奶牛酸碱平衡、血浆钙浓度及抗氧化应激的影响

DOI: 10.3969/j.issn.1006-267x.2013.04.025

Keywords: 饲粮阴阳离子差,血浆钙,抗氧化应激,围产期奶牛

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Abstract:

本试验旨在研究不同水平饲粮阴阳离子差(DCAD)对围产期奶牛酸碱平衡、血浆钙浓度及抗氧化应激的影响。选用39头经产预产前28d、体重、年龄相近的荷斯坦奶牛,按单因子随机区组试验设计分为3组,每组13头牛,分别饲喂DCAD为+175、-35、-183的试验饲粮。DCAD水平通过在饲粮中添加阴离子盐配制。试验期60d,其中预试期10d,正试期50d。结果表明,降低DCAD水平可降低尿液pH(P<0.05),提高血浆钙浓度(P<0.05);但对血浆抗氧化应激指标均没有显著影响(P>0.05)。奶牛产后产奶量和乳成分不受产前DCAD水平的影响(P>0.05)。由此可见,降低围产前期奶牛DCAD水平可降低尿液pH,有利于维持血浆钙稳定,对抗氧化应激能力没有影响。

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