摘要
本试验研究了不同干草水分含量（17％和27％～28％）及高水分干草（27%～28％）中添加不同防霉复合添加剂对苜蓿干草贮藏过程中营养成分变化的影响，以筛选能较好地保存苜蓿干草的措施。结果表明，高水分无添加剂（CKg）贮藏的干草能在扣捆初期有效保存干草中粗蛋白质（CP）和可溶性糖（WSC）的含量，减少其损失，且纤维含量比低水分干草（CKd）低。但60d保存后其品质迅速降低，甚至不如低水分贮存的干草。2种复合添加剂（SG和CA）处理的高水分干草保存60d后，干草中CP和WSC的含量显著高于无添加剂高水分和低水分处理组（P〈0．05），非蛋白氮（NPN）含量显著低于CKg（P〈0．05），其干草保存后期品质相对较好；添加剂CA处理的高水分干草其CP含量显著高于无添加剂组CKd和CKg（P〈0．05），而WSC、Ash、DM含量显著高于无添加剂组和SG添加剂处理的高水分组（P〈0．05），且NPN和中性洗涤纤维（NDF）含量较低。干草品质评定结果表明，添加剂CA处理的高水分干草其CP、酸性洗涤纤维（ADF）和可消化干物质（DDM）含量均达到特级标准，干草保存效果优于其他处理组。
To select an optimal method for hay preservation, the effects of different moisture levels and applications of two chemical compound additives at bundling on preserved hay quality were investigated. The two chemical compound additives （SG and CA） used are both generally used for consuming oxygen and inhibiting mold or clostridia growth. The moisture treatments included high （27% to 28%） and low （17%） levels. Hay samples were collected at 0, 5, 10, 25, and 60 d before or after bundling. Under high levels of moisture, hay preservation without additives effectively preserved CP and WSC during the early stage of preservation, and the fiber content of the hay was relatively low. However, the quality of hay with a high level of moisture was lower at the late stage than that with a low level of moisture （P〈0.05）. Hay preservation with a high level of moisture and additives preserved CP and WSC well, and the concentrations of NPN and ADF in the hay were lower （P〈0.05） than those in the hay preserved under a high level of moisture without additives. Therefore, good quality hay preservation with a high level of moisture can be obtained by addition of chemical additives at bundling. Adding CA, a complex chemical additive used against mold, could also maintain high levels of WSC, Ash, DM, CP and low levels of NPN and NDF during hay preservation. According to the standards of hay quality evaluation, all indexes of CP, ADF and DDM conferred superfine grade for the hay treated with CA. The use of CA for hay preservation was better than that of SG in terms of hay quality.
出处
《草业学报》
CSCD
北大核心
2014年第3期241-247,共7页
Acta Prataculturae Sinica
基金
"十二五"国家科技支撑计划课题(2011BAD17B02)资助
关键词
苜蓿干草
水分
添加剂
品质
alfalfa hay
moisture content
additives
quality
