刈割茬次对杂交构树青贮发酵品质和营养价值的影响

旨在探究刈割茬次对杂交构树青贮发酵品质和常规养分价值的影响.选取品种、播种期、生境和管理相同,年刈割3茬的杂交构树作为研究对象,于播种后14个月收获第1茬,此后每间隔35 d左右收获第2、3茬,收获后即进行窖贮.发酵完成后,对第1、2、3茬杂交构树青贮的发酵品质和营养价值进行评价.结果:在青贮发酵品质上,随着杂交构树收...

Effect of clipping stubbles on fermentation quality and nutrient components of hybrid Broussonetia papyrifera silage

This study was to evaluate the fermentation quality and conventional nutrient components of hybrid Broussonetia papyrifera silage under the conditions of different clipping stubbles.The samples of hybrid B.papyrifera,being clipped three stubbles per year and of the same variety,and under the same sowing time,habitat and management,were selected as the research subjects.The first stubble of the forage grass was harvested in the 14 th month after sowing,and the second and third stubbles were harvested at intervals of about 35 days,and then the clippings were ensiled immediately.After the fermentation was completed,the fermentation quality and nutritional value of the hybrid Broussonetia papyrifera silage of different clipping stubbles were evaluated.The results were as follows:1)In terms of the quality of silage fermentation,the pH,butyric acid content and V-Score of the silage decreased significantly(P<0.05)with the increase of clipping stubbles,while the content of lactic acid and acetic acid increased gradually.The ratio of NH3-N/TN of the silage of each clipping stubble was significantly different(P<0.05),in the order from low to high were the third,the first and the second stubbles.2)Of the conventional nutrients,the CP,SP,NPN and WSC contents iqn the silage were significantly different(P<0.05),in the order from high to low were the third,the first,the second stubbles,while the order of the NDF and ADF content were the opposite(P<0.05).The ADL content was the highest in the second stubble,and the NDIP and ADIP contents were the lowest in the third stubble.The DM and starch contents in the silage of each stubble were significantly different(P<0.05),presenting a trend of the first stubble>the third stubble>the second stubble,while the fat content was in the opposite order,showing a trend of the first stubblethe first stubble>the second stubble.To sum up,the quality of hybrid B.papyrifera silage was of the third,the second and the first stubble in the order of good to inferior,and the values of the conventional nutrition were in the order of the third,the first,and the second stubbles.