【摘要】 本试验以安装有永久性瘤胃瘘管的3头荷斯坦奶牛为动物模型,利用体外批次培养法,比较研究了玉米青贮、苜蓿干草、羊草和玉米秸秆等四种单一粗饲料体外发酵效果。本试验以GI为指标对粗饲料品质进行测定,GI指数分别为9.05MJ、48.71MJ、9.41MJ和1.81MJ。结果表明:粗饲料品质对培养液pH值有显著影响(P<0.05),平均值分别为(6.436、.476、.506、.41),随着培养时间的延长,各组pH值均呈下降趋势,其中秸秆组下降幅度最大,24h培养液pH值为6.27,羊草组pH值下降幅度最小;粗饲料品质对培养液NH3-N、产气量、VFAs和BCP产量有显著影响(P<0.05),其中苜蓿最高,秸秆最低,青贮NH3-N和VFA产量高于羊草,羊草产气量和BCP产量高于青贮;各组培养液乙/丙比例平均值大小顺序为羊草>秸秆>苜蓿>青贮,平均值分别为(2.132、.042、.001、.73)。更多还原

【Abstract】 In This experiment,to use the three Holstein cows with ruminal cannula as an animal models.Based on in vitro batch incubation to study the effect of ferment of vitro by four kinds of single forage which were Alfalfa hay,Chinese wildrye,Corn straw and Corn silage.Grading index as target evaluate the roughage quality,grading index was respectively 9.05MJ,48.71MJ,9.41MJ and 1.81MJ.The results showed that: pH value was influenced significantly by forage quality(P<0.05).The average value was 6.43、6.47、6.50 and 6.41 respectively.The ph value of each group was falling as the time longer.Among them,corn straw had the largest decline.pH value was 6.27 when 24 hours.The group of Chinese wildrye had the smallest decline.NH3-N,VFAs,BCP and gas production was influenced significantly by forage quality(P<0.05).Among them,the affect of Alfalfa hay was the highest,Corn straw was the lowest.The production of Corn silage,NH3-N and VFA was higher than Chinese wildrye;Gas production of Chinese wildrye and the production of BCP was higher than Corn silage.The order in PH value of A/P was Chinese wildrye>Corn straw>Alfalfa hay>Corn silage;The average value was 2.13,2.04,2.00,1.73 respectively.更多还原