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草业学报  2015 

凋萎和不同添加剂对紫花苜蓿青贮品质的影响

DOI: 10.11686/cyxb20150515, PP. 126-133

Keywords: 凋萎,添加剂,紫花苜蓿,青贮品质

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Abstract:

以孕蕾后期至初花期紫花苜蓿为材料,在实验室条件下研究了两种凋萎程度(晾晒3h和晾晒12h),对应含水率分别为72.6%和61.8%的苜蓿草分别添加乳酸菌接种剂(LAB)、甜菜粕(SB)、乳酸菌+甜菜粕(LAB+SB)、甲酸钠(SF)、甲酸钠+甜菜粕(SF+SB)五组不同添加剂处理及对照组(CK)对苜蓿青贮发酵品质和主要营养成分含量的影响。青贮65d开封,对青贮进行了感官评定和实验室评定。结果表明,1)添加剂对苜蓿青贮发酵品质有极显著的影响(P<0.01),各种添加剂均不同程度地提高了苜蓿青贮饲料的发酵品质,显著降低了青贮饲料的pH和氨态氮含量;2)两种凋萎程度下苜蓿青贮的NDF、ADF和干物质回收率均与对照组差异不显著,LAB+SB和SF处理显著提高了青贮饲料WSC的含量(P<0.05),添加SB显著降低了青贮饲料的CP值(P<0.05);3)提高原料的凋萎程度能够改善苜蓿青贮饲料的发酵品质,显著提高青贮饲料的CP和WSC含量(P<0.05)。总体来说,不同添加剂的青贮效果不同,添加LAB+SB的青贮品质最佳。

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