Evaluation Of Nutritional Value Of Mixed Silage Of Whole Broussonetia Papyrifera And Study On TMR Preservation Effect Of Silage Broussonetia Papyrifera

Hybrid Broussonetia papyrifera（L）Vent.is a new type of high-protein woody plant,and its feed application can alleviate the bottleneck problem of feed resource shortage in China.The seasonal growth characteristics make the utilization of Broussonetia papyrifera silage particularly important.However,the high water content and low soluble sugar content of Broussonetia papyrifera are the industrial problems in the production of Broussonetia papyrifera silage.The purpose of this study was to screen the appropriate ratio of hybrid Broussonetia papyrifera silage to conventional feed in order to improve the quality of silage Broussonetia papyrifera and provide a scientific basis for further development of hybrid Broussonetia papyrifera resources and application in dairy goat breeding.Exp.1 Effect of oat hay addition level on silage quality of hybrid Broussonetia papyriferaIn order to solve the problem of low dry matter content in silage hybrid Broussonetia papyrifera,different proportions of oat hay were added to silage hybrid Broussonetia papyrifera to explore the effect of oat hay on silage quality.The whole hybrid Broussonetia papyrifera and dried oat grass were used as experimental materials in the experiment.According to the fresh weight/mass ratio of 10:0（0%dried oat grass group）,9:1（10%dried oat grass group）,and 8:2（20%dried oat grass group）,they were mixed and ensiled for 30 d,90 d,and 180 d.The conventional nutrients,fermentation quality,and Cornell net carbohydrate and protein system（CNCPS）components（PA,PB₁,PB₂,PB₃,PC and CA,CB₁,CB₂,and CC）were determined.The results showed that the crude protein content was17.49%and the water content was 76.74%in the whole hybrid Broussonetia papyrifera.Compared with the 0%oat hay group,the addition of oat hay to hybrid paper mulberry improved sensory scores and dry matter（DM）,neutral detergent fiber（NDF）,PA components and lactic acid content（P<0.05）,and decreased ammonia The ratio of nitrogen/total nitrogen and the content of crude protein（CP）,PB₁ and PC components（P<0.05）had no significant effect on p H,CB₁and CC components（P>0.05）;Compared with10%oat hay group,20%oat hay group had higher lactic acid and PA content,lower PC component（P<0.05）,and silage moisture was about 65%.This experiment showed that the addition of 20%oat hay to the whole hybrid Broussonetia papyrifera could better regulate the water content of silage and improve the fermentation quality of silage.Exp.2 Effects of Different Raw Material Levels and Combinations on Silage Quality of Hybrid Broussonetia papyriferaIn Exp.1,the water content of silage Broussonetia papyrifera was adjusted by adding oat hay.The fermentation quality was improved to a certain extent,but the sensory and p H values did not reach the level of high-quality silage.Therefore,on the basis of Exp.1,the quality of hybrid Broussonetia papyrifera silage was improved by adding whole plant wheat,whole plant rye and whole plant oat at wax maturity stage.In the experiment,20%oat hay was added into the whole plant hybrid Broussonetia papyrifera as the control group and the basic substrate,and 20%and 40%fresh weight of whole plant wheat,whole plant rye and whole plant oat were added in the wax-ripening stage,respectively.The bags were wrapped and silaged for 30 d,90 d and 180 d,and the nutritional components,fermentation quality and CNCPS system co mponents were determined.The results showed that the water content of hybrid Broussonetia papyrifera silage could be maintained at 60%–70%by adding 20%and 40%of each raw material.Compared with 20%other raw material group,20%wheat group had lower NDF,ADF content and p H value and ammonia nitrogen/total nitrogen ratio（P<0.05）,and the unusable components（PC and CC）in CNCPS were relatively lower（P>0.05）;Compared with 40%other raw material group,40%wheat group had lower p H value and CC content（P<0.05）,and higher CHO,CB₁,NSC content（P<0.05）.The results showed that adding 20%oat hay as basic substrate and adding 20%and 40%wheat at wax ripening stage had better silage effect.Exp.3 Silage TMR preservation effect of hybrid Broussonetia papyriferaIn this study,the total mixed diet（TMR）prepared from silage hybrid Broussonetia papyrifera was used as the experimental material,and three TMR treatments were designed,namely,the control group without treatment,the probiotics group with 10⁶cfu/g DM^-1Bacillus and 10⁶cfu/g DM^-1 Enterococcus faecalis,and the propionate group with 1.0 g/kg DM^-1 propionate.The three TMR treatments were respectively put into 20 cm×30 cm polyethylene silage bags,vacuumized by vacuum pump,and sealed by the sealing machine.Half of each treatment was stored at room temperature in the room,and the other half was stored at 35°C in the oven.The bags were opened on days 0,3,5 and 12,respectively.Ensure three repetitions per processing time point.The results showed that compared with the control group,the addition of probiotics or propionic acid could reduce the DM loss and ammonia nitrogen/total nitrogen ratio during TMR preservation（P<0.05）.This experiment showed that the addition of compound probiotics or propionic acid composed of Bacillus and Enterococcus faecalis had a certain effect on the short-term preservation of TMR.