不同收获期青贮玉米贮前和贮后营养含量变化研究

The Research of Nutritive Contents Change between Whole Plant Corn and Corn Silage Harvested at Different Growth Period

本文对乳熟前期、乳熟期和蜡熟期青贮玉米贮前和贮后主要营养成分进行了测试分析,结果表明:蜡熟期青贮玉米贮前和贮后的营养含量均高于乳熟前期和乳熟期,如蜡熟期青贮玉米贮前的DM(29.89%)分别比乳熟前期(23.17%)和乳熟期(23.17%)高6.72(P<0.01)和4.72(P<0.05)个百分点,乳熟期比乳熟前期高2个百分点(P<0.05);蜡熟期青贮玉米贮后的DM分别比乳熟前期和乳熟期高5.7(P<0.01)和5.18(P<0.01)个百分点。同一收获期的青贮玉米贮后营养物质含量有所降低,如乳熟前期、乳熟期和蜡熟期青贮玉米贮后DM均分别比贮前下降1.47(P<0.05)、2.95(P<0.05)和2.49(P<0.05)个百分点。

This article measured the main nutritive contents of whole plant corn and corn silage that harvested at different period respectively （premilk stage, milk stage, dough stage）. The results showed that the nutritive contents of whole plant corn and corn silage harvested at dough stage were higher than it harvested at pre- milk stage and milk stage respectively. Such as： the DM of whole plant corn at dough stage were higher 6.72 percentage than it harvested at premilk stage （P〈 0.01 ） and higher 4.72 percentage than it harvested at milk stage （P 〈 0.05）. The DM of whole plant corn harvested at milk stage was higher 2 percentage than it harvested at premilk stage （P〈0.05）. The DM of corn silage at dough stage was higher 5.7 percentage than premilk stage （P〈0.01） and higher 5.18 percentage than milk stage （P〈0.01） respectively. The nutritive contents of corn silage at same harvested period were all lower than nutritive contents of whole plant corn. Such as： the DM of corn silage at premilk stage and milk stage and dough milk were lower 1.47 percentage （P 〈0.05）, 2.95 percentage （P〈0.05）, 2.49 percentage （P〈0.05） than the DM of whole plant corn at the same period respectively.