Effects of Different Proportions of Quinoa Stalk and Orchardgrass Mixed Silage on Silage Quality
[Objective]This study aims to investigate the impact of mixed ensilage of quinoa straw and or-chardgrass at varying proportions on silage quality.[Method]Quinoa straw and orchardgrass were mixed in fresh weight ratios of 10∶0(A),9∶1(B),7∶3(C),5∶5(D),3∶7(E),1∶9(F),and 0∶10(G),respectively.The mixtures were ensiled for 60 days at room temperature,and samples were collected to as-sess the quality of silage.[Result]Mixed ensilage(Groups B,C,D,E,F)exhibited higher levels of crude protein(CP),crude ash(Ash),crude fat(EE),and soluble carbohydrates(WSC)compared to quinoa straw alone(Group A).With an increase in the proportion of orchardgrass,the content of CP,Ash,EE,and WSC gradually increased,while acid detergent fiber(ADF)and neutral detergent fiber(NDF)values decreased.Principal component analysis extracted two principal components with a cumu-lative contribution rate of 88.9%.Comprehensive evaluation of principal components,relative feed value(RFV)and grading index(GI)consistently indicated that quinoa straw alone had the lowest feeding value,while orchardgrass alone had the highest.Mixed ensilage with quinoa straw and orchardgrass at ra-tios of 3∶7 and 1∶9 in fresh weight showed no significant differences in silage quality and outperformed other mixed ratios.[Conclusion]The mixed silage of quinoa straw and orchardgrass contributes to the improvement of silage quality,with a recommended proportion of 70%to 90%for orchardgrass.
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