营养研究NO.022023100饲料研究FEEDRESEARCH不同留茬高度对雅玉青贮8号品质的影响王胜男王嘉麟吴鹏鑫许悦雯邱晓媛尹福泉*(广东海洋大学滨海农业学院,广东湛江524088)摘要:试验旨在探究留茬高度对青贮玉米品质的影响。试验选用雅玉青贮8号,按随机区组进行种植,于蜡熟期收获,设置15、25、35、45cm等4个留茬高度处理组(Ⅰ组、Ⅱ组、Ⅲ组、Ⅳ组),每个处理组设置3个重复。收割后粉碎装袋,青贮90d测定品质。结果显示,随留茬高度增加,雅玉青贮8号粗蛋白(CP)含量呈上升趋势,Ⅳ组CP含量显著高于Ⅰ组、Ⅱ组、Ⅲ组(P<0.05)。Ⅰ组酸性洗涤纤维(ADF)、中性洗涤纤维(NDF)含量显著高于Ⅳ组(P<0.05)。与Ⅰ组相比,Ⅳ组的总可消化养分(TDN)、维持净能(NEm)、增重净能(NEg)均显著提高(P<0.05)。随留茬高度增加,非纤维性碳水化合物和非结构性碳水化合物呈上升趋势(P>0.05);Ⅳ组非纤维性碳水化合物含量显著高于Ⅰ组(P<0.05)。Ⅳ组干物质(DM)、NDF、CP降解率显著高于其他组(P<0.05)。研究表明,雅玉青贮8号在湛江适宜的留茬高度为35~45cm。关键词:雅玉青贮8号;留茬高度;营养成分;发酵品质;能量代谢中图分类号:S816文献标识码:A文章编号:1002-2813(2023)02-0100-05Doi:10.13557/j.cnki.issn1002-2813.2023.02.020EffectofdifferentstubbleheightonqualityofYayuSilageNo.8WANGSheng-nanWANGJia-linWUPeng-xinXUYue-wenQIUXiao-yuanYINFu-quanAbstract:Theexperimentwastoexploretheeffectofstubbleheightonqualityofsilagecorn.YayuSilageNo.8wasselectedforexperiment.Itwasplantedinrandomgroupsandharvestedatthewaxyripeningstage.Fourstubbleheighttreatmentgroups(groupⅠ,groupⅡ,groupⅢandgroupⅣ)weresetup,including15,25,35and45cm,andeachtreatmentgroupwassetupwiththreereplicates.Crushandbagafterharvest,andmeasurethequalityafter90dofsilage.TheresultsshowedthatthecrudeproteincontentofYayuSilageNo.8increasedwiththeincreaseofstubbleheight,andthecrudeproteincontentingroupⅣwassignificantlyhigherthanthatingroupⅠ,groupⅡandgroupⅢ(P<0.05).ThecontentofADFandNDFingroupⅠwassignificantlyhigherthanthatingroupⅣ(P<0.05).ComparedwithgroupⅠ,TDN,NEmandNEgingroupⅣweresignificantlyincreased(P<0.05).Withtheincreaseofstubbleheight,thenon-fibrouscarbohydrateandnon-stru...