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草业学报  2015 

中草药制剂对热应激奶牛泌乳性能、抗氧化能力及免疫功能的影响

DOI: 10.11686/cyxb20150117, PP. 132-140

Keywords: 奶牛,中草药,泌乳性能,抗氧化能力,免疫功能

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Abstract:

为探讨复合中草药制剂对热应激奶牛泌乳性能、抗氧化能力及免疫功能的影响,选择产奶中后期的健康中国荷斯坦奶牛20头,按泌乳时间和产奶量相近的原则均分为A、B、C和D4组。A组为对照组,饲喂基础日粮;B、C和D组分别在每头牛的基础日粮中添加50,100和150g/d水平的复合中草药制剂。每天测定产奶量,在试验的第1(添加复合中草药制剂之前)、20和40天逐头采集血样,测定不同剂量复合中草药制剂对热应激奶牛血淋巴细胞凋亡率、血液抗氧化酶GSH-Px、CAT基因及血淋巴细胞凋亡相关基因Bcl-2、p53表达水平的影响。结果表明,B、C和D组的日产奶量较对照组分别提高了20.26%(P<0.05),24.20%(P<0.05)和16.98%(P>0.05);乳中体细胞数较对照组分别降低了21.68%(P<0.05),29.88%(P<0.05)和24.22%(P<0.05);奶牛血液抗氧化酶GSH-Px、CAT基因的表达水平分别比对照组提高了5.00%(P>0.05),13.00%(P<0.05),6.00%(P>0.05)和5.00%(P>0.05),16.00%(P<0.05),3.00%(P>0.05);奶牛血淋巴细胞平均凋亡率分别比A组降低了18.20%(P>0.05),17.86%(P>0.05)和12.51%(P>0.05);奶牛血淋巴细胞Bcl-2在20,40d时均极显著高于A组,全期的平均水平分别比对照组高出105.00%(P>0.05),113.00%(P>0.05)和57.00%(P>0.05);p53基因的表达水平在20,40d时均极显著低于A组,全期的平均水平分别比对照组降低了24.00%(P>0.05),28.00%(P>0.05)和20.00%(P>0.05)。试验组中,C组奶牛的日产奶量、体细胞数、血液抗氧化酶活性、淋巴细胞凋亡相关基因表达等指标要优于B、D组;而血液淋巴细胞凋亡率指标为B组最好。说明复合中草药制剂能有效改善热应激奶牛的泌乳性能、抗氧化能力及免疫功能,且在本试验条件下,每头牛日粮中添加100g/d水平的效果要优于50及150g/d水平。

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