全株玉米青贮饲料、苜蓿及谷草间组合效应的研究

发布时间：2018-02-10 19:36

本文关键词： 全株玉米青贮饲料苜蓿干草谷草组合效应　出处：《中国饲料》2017年02期 　论文类型：期刊论文

【摘要】：本试验旨在研究全株玉米青贮(WCS)、苜蓿干草(AH)及谷草(MS)间的组合效应。将WCS与AH以100∶0,80∶20,60∶40,50∶50,40∶60,20∶80,0∶100 7种比例组合,筛选出WCS与AH间的最优组合,将此组合再与MS按照上述7种比例组合。通过体外发酵技术测定72 h产气量(GP),检测体外培养液72 h的干物质消失率(DML)、NH3-N、微生物蛋白(MCP)及挥发性脂肪酸(VFA)产量,并计算各个指标的单项组合效应指数(SFAEI)和多项组合效应指数(MFAEI)。结果表明:在不同比例WCS与AH的组合中,72 h累积GP及DML均以80∶20组合最高(P0.01),且随着AH比例的增加而降低;MCP产量、NH3-N浓度及VFA随着AH比例的增加呈现先上升后下降的趋势,在60∶40组合时MCP产量最大(P0.05);GP与DML的SFAEI在80∶20组合最大,其他指标的SFAEI均在60∶40组合最大,MFAEI以60∶40组合最大。在WCS-AH最优组合(60∶40)与MS的组合中,72 h GP与DML以100∶0组合最高(P0.01),并且随着MS比例的增加而降低;其余三个指标均为80∶20组合最大;GP及DML的SFAEI均以60∶40组合最大,其余三个指标的SFAEI及MFAEI均以80∶20组合最大。综上,在本试验设计条件下,WCS、AH和MS的最适组合比例为48∶32∶20。
[Abstract]:The purpose of this study was to study the combined effect of WCS and AH between the whole corn silage, alfalfa hay (AH) and alfalfa straw (MS). The optimal combination of WCS and AH was selected by using the ratio of 100: 0: 0: 80: 20: 20: 40: 50: 50: 50: 60: 60: 80: 80: 0: 100. This combination was combined with MS according to the above 7 ratios. The gas production in 72 h was determined by in vitro fermentation. The dry matter disappearance rate (DMLN), microbial protein (MCPP) and volatile fatty acid (VFAs) were measured at 72 h in vitro culture medium. The single combination effect index (SFAEI) of each index and the multiple combination effect index (MFAEII) were calculated. The results show that in the combinations of different proportions of WCS and AH, the highest accumulative GP and DML for 72 h are 80: 20 combinations (P0.01U), and decrease with the increase of AH ratio. The concentration of NH3-N and VFA increased firstly and then decreased with the increase of AH ratio. In combination 60: 40, the maximum yield of MCP is P0.05 and the SFAEI of DML is the largest in combination 80: 20. The SFAEI of the other indexes was the largest in the combination of 60: 40 and 60: 40. In the combination of WCS-AH optimum combination of 60: 40) and MS, the maximum value of GP and DML was 100: 0 in 72 h and 100: 0, respectively, and decreased with the increase of the ratio of MS. The SFAEI of the other three indexes are all the largest in the combination of 80: 20 and the SFAEI of the DML is the largest in the combination of 60: 40, and the SFAEI and MFAEI of the other three indexes are all the largest in the combination of 80: 20. In summary, the optimum combination ratio of WCSAH and MS is 48: 32: 20 under the design condition of this experiment.
【作者单位】：河北农业大学动物科技学院;河北农业大学养牛科学研究所;河北农业大学动物医学院;
【基金】：农业部公益性行业专项(201503134) 河北省科技计划项目(16226604D) 国家现代农业产业技术体系(CARS-37) 河北省农业产业技术体系奶牛创新团队(HBCT2013080201)
【分类号】：S816.53

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