本文旨在研究复合处理麦秸、青贮玉米秸和精料的组合及比例对奶牛体外瘤胃发酵的影响。将复合处理麦秸、青贮玉米秸、精料两两组合,且每种组合均设6个组合比例(0:100、20:80、40:60、60:40、80:20、100:0),筛选出最优复合处理麦秸与青贮玉米秸比例后再与精料以这6个比例组合,每个组合3个重复。通过短期人工瘤胃技术测定体外瘤胃发酵参数的变化。结果表明:3种饲料的组合和比例对瘤胃液pH影响不显著(P>0.05),所有组合氨氮浓度均在正常范围内;综合考察微生物蛋白质(MCP)产量和挥发性脂肪酸(VFA)浓度,得出各组合中的最优比例分别为复合处理麦秸:青贮玉米秸=40:60、复合处理麦秸:精料=60:40、青贮玉米秸:精料=60:40以及最优复合处理麦秸与青贮玉米秸组合(40:60):精料=80:20。综上所述,复合处理麦秸、青贮玉米秸和精料最优的组合比例是32:48:20。
The present experiment was conducted to investigate the effects of combinations and proportions of combination-treated wheat straw (CW), maize straw silage (MS) and concentrate (CC) on rumen fermentation of dairy cows in vitro. CW, MS and CC were grouped in pairs, and 6 proportions (0:100, 20:80, 40:60, 60:40, 80:20 and 100:0) were set in each group. After the best combination of CW-MS was determined, the best combination of CW-MS was grouped with CC at the 6 proportions. Three replicates were set in each group. Fermentation characteristics were determined by short-term artificial rumen technique. The results showed as follows: there was no significant difference in pH among all treatments (P>0.05), and NH3-N concentration ranged within normal limits; the best combinations were CW:MS=40:60, CW:CC=60:40 and MS:CC=60:40, and the best combination of CW-MS:CC=80:20 considering indices of microbial protein (MCP) and volatile fatty acid (VFA) concentrations. In conclusion, the best combination of CW, MS and CC is 32:48:20.
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