贮藏方式和时间对紫花苜蓿干草营养品质的影响

Effects of storage methods and time on the nutritionalquality of alfalfa hay

摘要:

为探讨贮藏条件和贮藏时间对苜蓿干草品质的影响,以甘肃省酒泉市肃州区收获的第1茬紫花苜蓿草捆为材料,分别用露天贮藏、苫布贮藏和储草棚贮藏3种方式,研究贮藏0、30、60、90、150、210、270和360 d时苜蓿干草各营养指标的变化情况。结果表明:苜蓿干草的粗蛋白(CP)和粗脂肪(EE)含量随贮藏时间的延长呈明显下降趋势,粗灰分、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量显著增加,相对饲喂价值(RFV)则明显降低,苜蓿干草品质下降。3种贮藏方式中,露天贮藏下的干草营养物质损失最大,贮藏360 d蛋白质损失率是储草棚贮藏的1倍左右,粗灰分增加了17%,ADF和NDF分别增加了34.40%和27.70%,RFV下降了33.15%,干草品质最差。在甘肃河西地区,苜蓿干草捆最好在储草棚贮藏,时间控制在5个月内,以保证品质。

Abstract:

In order to explore the effects of storage method and time on alfalfa hay quality,the first cut and baled alfalfa in Suzhou District of Jiuquan City of GanSu province was used as materials.The variations of nutritional index ware investigated after 0,30,60,90,150,210,270 and 360 days of storage by three storage methods including storage shed store,open areas store with or without tarp cover.Results showed that within one year of storage,the content of crude protein (CP) and ether extract (EE) of alfalfa hay reduced,while the content of crude ash,neutral detergent fiber (NDF),and acid detergent fiber (ADF) increased significantly,and RFV value decreased remarkably,therefore,alfalfa hay quality declined.Among three storage methods,open area store caused greatest nutrient loss;during 360 days of storage,its CP loss was one time higher than that of storage shed store,crude ash increased 17%,ADF and NDF increased 34.40% and 27.70% respectively,while RFV reduced 33.15%,leading to the poorest hay quality.Thus,in Hexi area,alfalfa hay should be stored in storage shed within 5 months to keep quality.