Effects Of Different Processing Methods On Nutritive Value Of Broussonetia

Broussonetia papyrifera(L.)Vent is a new type of high-protein woody feed,but few researches have been conducted on the processing and utilization mode of broussonetia.In order to explore the effects of different processing and shredding methods and cutting height on the nutrient composition and feeding value of broussonetia,the present research takes the broussonetia as the research material,which was cut at different heights(60 cm,90 cm,120 cm and 150 cm)with different shredding methods(cutting and kneading)and processed as silage and green hay.After 60 days,the nutritional quality was evaluated for its routine nutrient components,amino acids and in vitro digestibility.The research results showed that:(1)The fermentation quality of broussonetia silage processed with kneading and cut at the height of 60 cm,90cm,12 cm and 150 cm was higher than that processed with cutting,the pH and ammonia nitrogen content decreased significantly(P < 0.05).For green hay and silage,the cellulose content increased and crude protein content decreased with cutting height increasing.(2)According to the research,the total amino acid content(mainly aspartic acid and glutamic acid)of broussonetia ranked as fresh plants > green hay > silage.For the silage and green hay cut at the same height,the total amino acid content of the broussonetia processed with cutting was higher than that of broussonetia treated with kneading(P < 0.05),and among them,the treatment group at the cutting height of 150 cm showed the significant difference(P < 0.05).Comparison with the fresh plants,the contents of proline,glycine,alanine,valine and lysine increased significantly in the treatment groups of silage and green hay(P < 0.05).WHO/FAO showed that EAA/NEAA > 60% and EAA/TAA > 40%,which could be a high quality protein source for livestock and poultry,and EAAI > 0.95 conformed to the high quality protein source.In this experiment,the amino acid content of all treatment groups was in line with the recommended values of WHO/FAO and EAAI,so it could be a good source of protein feed.(3)The results of in vitro gas production and artificial rumen digestibility test showed that the degradation rate of the fresh broussonetia plants was the highest,and that of green hay was the lowest.With the prolongation of fermentation time in vitro,the gas production of broussonetia increased gradually.The in vitro gas production of different treatment groups ranked as green hay > fresh plants > silage.