摘要
将选用的宁夏苜蓿草颗粒和西班牙苜蓿草颗粒粉碎后分别过40目(粒径0.425 mm)、60目(粒径0.25mm)、80目(粒径0.18mm)分析筛,分别测定草粉样品中的常规养分和纤维含量,以评价不同来源和粉碎粒度对苜蓿草粉营养价值的影响。结果表明:西班牙阿拉贡苜蓿草粉的干物质(DM)、粗脂肪(EE)、粗纤维(CF)、中性洗涤纤维(NDF)和磷(P)含量均极显著高于宁夏固原草粉(P<0.01),酸性洗涤纤维(ADF)显著高于宁夏固原草粉(P<0.05),而粗蛋白质(CP)、粗灰分(Ash)、钙(Ca)和酸性洗涤木质素(ADL)含量极显著低于宁夏固原草粉(P<0.01)。随着粉碎粒度的降低,DM、CP、EE、Ash 4个养分测定结果极显著提高(P<0.01),CF、NDF、ADF和ADL 4项指标极显著降低(P<0.01)。而0.25mm和0.18mm的草粉Ca、P测定结果差异不显著,但Ca、P测定结果分别极显著(P<0.01)、显著(P<0.05)高于0.425 mm的草粉。建议使用时苜蓿草粉适宜粉碎粒度为0.25mm。
The samples of Ningxia alfalfa pelletsand Spanish alfalfa pelletswere selected and crushed,and then passed through 40 mesh(particle size is 0.425 mm),60 mesh(particle size is 0.25 mm)and 80 mesh(particle size is 0.18 mm)sieves respectively.The contents of conventional nutrient and fiber in samples were determined by chemical analysisto evaluate the effects of different sources and particle sizes on the nutritive value of alfalfa meal.The results showed that the contents of dry matter(DM),crude fat(EE),crude fiber(CF),neutral detergent fiber(NDF)and phosphorus(P)of Aragon alfalfa were significantly higher than those of Guyuan alfalfa meal(P<0.01)in Ningxia.The content ofacid detergent fiber(ADF)was significantly higher than Ningxia Guyuan alfalfa meal(P<0.05),and the contents ofcrude protein(CP),ash(Ash),calcium(Ca)and acid detergent lignin(ADL)were significantly lower than those of Ningxia Guyuan alfalfa meal(P<0.01).With the reduction of grinding particle size,the contents of DM,CP,EE and Ashwere significantly improved(P<0.01),and the contents of CF,NDF,ADF and ADL were significantly reduced(P<0.01).The results showed that there was no significant difference in the contentsof Ca and Pbetween alfalfa pellets passed through60 mesh and 80 mesh,but the difference was significantly higher(P<0.01)and higher(P<0.05)respectivelythan that of 40 mesh.It is suggested that the suitable particle size of alfalfa meal is 0.25 mm.
引文
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