摘要
试验采用体外产气法研究残次香梨和四翅滨藜混合青贮的饲用价值,选取5头体况相近、健康的卡拉库尔羊作为瘤胃液供体.采用单因素随机设计,共5个处理组,每个处理5个重复.按照四翅滨藜:残次香梨10∶0(对照,CON组)、8∶2(20 LW组)、7∶3(30 LW组)、6∶4(40 LW组)、5∶5(50 LW组)比例添加,再添加1×106CFU/g的乳酸菌进行混贮.青贮90d后测定营养成分、发酵品质、产气参数及主要营养成分的瘤胃降解率.结果显示:与对照组相比,各混合试验组青贮饲料的中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量显著降低(P＜0.05),可溶性化合物(WSC)含量显著提高(P＜0.05).与对照组相比,混合试验组青贮饲料中乳酸(LA)、乙酸(AA)及氨态氮(NH3-N)含量显著提升(P＜0.05),丙酸(PA)、丁酸(BA)含量和pH值显著降低(P＜0.05).40 LW组和50 LW组的产气速率显著高于其余3组(P＜0.05).与对照组相比,各混合试验组的干物质(DM)、NDF和ADF瘤胃降解率显著升高(P＜0.05).研究表明,残次香梨和四翅滨藜混合青贮可促进体外瘤胃发酵,且四翅滨藜与残次香梨比例为7∶3和6∶4效果最佳.
Abstract
The experiment used the in vitro gas production method to study the feeding value of mixed silage with defective pears and Atriplex canescens,selecting 5 healthy Karakul sheep with similar body conditions as the rumen fluid donors.A single-factor random design was adopted,with a total of five treatment groups,each with five replicates.The proportions of Atriplex canescens to defective pears were added as 10:0(control,CON group),8∶2(20 LW group),7∶3(30 LW group),6∶4(40 LW group),and 5∶5(50 LW group),and then mixed with 1 × 106 CFU/g of lactic acid bacteria for silage.After ensiling for 90 days,the nutritional components,fermentation quality,gas production parameters,and ruminal degradability of the main nutrients were measured.The results showed that compared to the control group,the neutral detergent fiber(NDF)and acid detergent fiber(ADF)content in the silage of all mixed experimental groups were significantly reduced(P＜0.05),while the content of water-soluble compounds(WSC)was significantly increased(P＜0.05).Compared to the control group,the contentrations of lactic acid(LA),acetic acid(AA)and the concentration of ammonia nitrogen(NH3-N)in the silage of the mixed experimental groups were significantly increased(P＜0.05),while the concentrations of propionic acid(PA)and butyric acid(BA)and the pH value were significantly decreased(P＜0.05).The gas production rate of the 40 LW group and 50 LW group were significantly higher than the other three groups(P＜0.05).Compared to the control group,the ruminal degradability of dry matter(DM),NDF,and ADF in all mixed experimental groups was significantly increased(P＜0.05).The study indicates that the mixed silage of defective pears and Atriplex canescens can promote rumen fermentation in vitro,and the proportions of Atriplex canescens to defective pears is 7∶3 and 6∶4.
基金项目
兵团重点领域科技攻关计划(2021AB022-4)
教育部基本科研业务费-对口支援科研合作基金项目(2022TC127)
教育部基本科研业务费-对口支援科研合作基金项目(ZNLH202203)
南疆重点产业创新发展支撑项目(2021DB015)
维普
万方数据