刈割期和添加剂对苜蓿青贮发酵品质和 CNCPS蛋白组分的影响

发布时间：2018-07-04 20:15

本文选题：苜蓿 + 青贮　；参考：《草业科学》2017年10期

【摘要】：为研究刈割时期及添加剂对苜蓿(Medicago sativa)青贮品质的影响,本试验选择2个茬次,现蕾、初花、盛花3个时期刈割,并以无添加(CK)、丙酸钠(SP,0.5%)、乳酸菌(LD,106 cfu·g~(-1))3种处理进行苜蓿青贮制作,在贮存45d后取样,分析其发酵品质及营养价值。结果发现,随着收获时期的延迟,青贮苜蓿pH值呈下降的趋势;丙酸钠及乳酸菌添加剂的添加对苜蓿青贮饲料的发酵品质有显著的改善作用;随着同一茬次生育期的延长,青贮苜蓿中的粗蛋白(CP)含量显著降低(P0.05);刈割时期可显著降低苜蓿青贮饲料的pH值并明显提高乳酸含量(P0.05),对乙酸及丙酸含量影响不显著(P0.05)。而添加剂可显著增加乙酸含量(P0.05),两者存在显著互作效应(P0.05)。添加乳酸菌的现蕾期苜蓿青贮品质最佳。应用康奈尔净碳水化合物-蛋白质体系(CNCPS)提出的方法测定表明,第1茬盛花期的苜蓿青贮饲料的非蛋白氮(PA)含量较高,苜蓿青贮饲料各处理中的中速降解蛋白质(PB2)含量均是占可降解蛋白质(PB)含量的最大比例。
[Abstract]:In order to study the effect of cutting period and additive on silage quality of alfalfa (Medicago sativa), the silage of alfalfa (Medicago sativa) was made with three treatments of no CK, sodium propionate (SP0. 5%) and lactic acid bacteria (LDX 106 cfu g ~ (-1). After 45 days of storage, the fermentation quality and nutritional value were analyzed. The results showed that the pH value of alfalfa decreased with the delay of harvest period, the fermentation quality of alfalfa silage was improved by the addition of sodium propionate and lactobacillus additive, and the growth period of the same crop was prolonged. The crude protein (CP) content in alfalfa silage was significantly decreased (P0.05), and the pH value of alfalfa silage was significantly decreased and the lactic acid content was significantly increased (P0.05) during cutting period, but there was no significant effect on the content of acetic acid and propionic acid (P0.05). The additive could significantly increase the content of acetic acid (P0.05), there was a significant interaction between the two (P0.05). Alfalfa silage with lactic acid bacteria was the best in budding stage. The method proposed by Cornell net carbohydrate protein system (CNCPS) showed that the content of non-protein nitrogen (PA) in alfalfa silage at the first full flowering stage was higher than that in the control group. The content of intermediate degradable protein (PB2) in alfalfa silage was the largest in the content of degradable protein (PB).
【作者单位】：中国农业大学动物科技学院;新疆畜牧科学院草业研究所;
【基金】：国家牧草产业技术体系(CARS-35) 公益性行业(农业)科研专项(201303061) 内蒙古自治区科技计划项目“苜蓿混合青贮调制技术研究与示范” 中央高校基本科研业务费专项资金(2017QC027) 农业技术试验示范专项经费(13162130106232057)
【分类号】：S816.53

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