Diets with similar concentrations of equivalent forage neutral detergent fiber (FNDF) and nonfiber carbohydrates(NFC) in corn-silage based diets could result in similar responses in ruminal function, digestibility and microbial protein synthesis. To prove this hypothesis, four different forages(alfalfa, oat straw, leymus chinensis and rice straw) were choosed as FNDF sources in this experiment. A completely random design was used and formulated diets consisted of corn silage providing about 24.9 g/100g FNDF with either alfalfa hay, oat straw, leymus Chinensis or rice straw that provided 4.75 g/100g FNDF. The results showed that: On the basis of corn silage diet, ruminal fermentation, fiber digestibility and microbial protein synthesis were similar among diets(P>0.05). Therefore, based on this study, it could be concluded that feeding these diets with similar concentration of FNDF and NFC to cows in late lactation provided evidence that high-quality forage could be substituted by low-quality forage.%假设在以玉米青贮为基础的日粮中,粗饲料来源中性洗涤纤维(FNDF)和非纤维性碳水化合物(NFC)浓度相同的日粮对瘤胃发酵、纤维消化和微生物蛋白合成无显著影响.为证明该假设,本试验通过体外培养法探究不同粗饲料来源(分别为苜蓿、燕麦草、羊草和稻草)对瘤胃发酵、纤维消化和微生物蛋白合成的影响.试验采用单因素设计,4组日粮中FNDF和NFC含量相同,各组日粮中FNDF含量为24.9g/100g DM,其中由玉米青贮提供20.25g/100g DM,其余4.75g/100g DM分别由苜蓿、燕麦草、羊草和稻草提供.结果表明:①在以玉米青贮为基础的日粮中,不同粗饲料来源日粮对瘤胃发酵和微生物蛋白合成无显著影响(P＞0).05)；②在以玉米青贮为基础的日粮中,不同粗饲料来源日粮对日粮中纤维消化无显著影响(P＞0.05).综上可知,对于泌乳后期奶牛而言,当日粮中FNDF和NFC含量相同时,可实现用低质牧草替代优质牧草.
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