The aim of this experiment was to study the effects of different harvest periods and additive treat-ments on the quality and in vitro digestibility of sweet sorghum silage.Sweet sorghum was harvested at heading stage,milk stage and dough stage,and a total of 12 treatments were set up,including control treatment(CK),Lactobacillus buchneri treatment(LB),cellulase treatment(CE)and bacterial-enzyme combined treatment(LB+CE)in each harvested stage,with 3 replicates per treatment.The sorghum was packed in a 3 L fermentation barrel and stored at room temperature for 120 days.The fermentation quality and nutrient contents were determined,and the principal component analysis and subordinate function analysis were used to evaluate the quality of sweet sorghum silage at different harvest stages and additive treatments.The results showed that there were significant interactions between harvest period and additive on pH,ammonia nitrogen/total nitrogen and contents of lactic acid,acetic acid,dry matter and neutral detergent fiber of sweet sorghum silage(P＜0.05).Compared with CK,CE and LB+CE significantly increased the lactic acid content of sweet sorghum si-lage at heading stage and milk stage(P＜0.05),LB and LB+CE significantly increased the acetic acid content at each harvest stage(P＜0.05),different additive treatments significantly increased the soluble carbohydrate content at milk stage(P＜0.05),and CE significantly decreased the neutral detergent fiber content at milk stage(P＜0.05).The in vitro dry matter digestibility of sweet sorghum silage was significantly affected by dif-ferent harvest periods(P＜0.05),and the in vitro dry matter digestibility of sweet sorghum silage harvested at dough stage was the highest.The results of principal component analysis and subordinate function analysis showed that the overall score of sweet sorghum was ranked as dough stage＞milk stage＞heading stage,and the subordinate function mean of LB+CE was the highest at dough stage.In conclusion,the dough stage is a timely harvest stage for sweet sorghum silage,and it is suggested that bacteria and enzymes should be used together.[Chinese Journal of Animal Nutrition,2024,36(5):3373-3385]
关键词
甜高粱/青贮饲料/收获期/添加剂/体外消化率/隶属函数评价
Key words
sweet sorghum/silage/harvest periods/additives/in vitro digestibility/subordinate function e-valuation
维普
万方数据