本试验旨在研究酒精清液发酵玉米秸秆替代全株玉米青贮对奶牛生产性能的影响。选取体重、年龄、胎次、产奶量和泌乳期相近的中国荷斯坦泌乳牛40头,随机分为2组,每组20头牛。试验分3期,各期的对照组均饲喂全株玉米青贮饲粮,各期的试验组分别饲喂用酒精清液发酵玉米秸秆替代30%(30%替代组)、60%(60%替代组)或100%(100%替代组)全株玉米青贮的试验饲粮。试验期27 d。结果表明:1)酒精清液发酵玉米秸秆的粗蛋白质(CP)、中性洗涤纤维(NDF)、中性洗涤不溶蛋白质(NDIP)和酸性洗涤不溶蛋白质(ADIP)含量都显著高于全株玉米青贮(P<0.05)。2)与对照组相比,60%替代组奶牛的干物质采食量(DMI)增加了9.45%(P<0.05),产奶量无显著变化(P>0.05);100%替代组奶牛的DMI差异不显著(P>0.05),但产奶量降低了12.05%(P<0.05)。3)各试验组中,乳成分的百分比与对照组相比均差异不显著(P>0.05)。与对照组相比,100%替代组乳蛋白的净含量提高了4.65%(P<0.05),而其他乳成分净含量显著降低(P<0.05)。由此可知,用酒精清液发酵玉米秸秆适量替代(30%或60%)全株玉米青贮不会影响奶牛的生产性能。

This experiment was conducted to determine the effects of substitution of fermented corn stover with alcohol wastewater for whole corn silage on performance of dairy cows. Forty Chinese Holstein dairy cows with the same body weight, age, fetal times and milk yield were randomly divided into 2 groups and 20 cows in each group. The experiment included three periods, cows in the control group were fed a basal diet in each period, and those in the experimental group were fed the experimental diet which replaced 30%(30% replacement group), 60%(60% replacement group) or 100% (100% replacement group)fermented corn stover with alcohol wastewater with whole corn silage in each period. The experiment lasted for 27 days. The results showed as follows: 1) the contents of crude protein, neutral detergent fiber, neutral detergent insoluble protein and acid detergent insoluble protein in fermented corn stover with alcohol wastewater were significantly higher than those in the whole corn silage (P<0.05). 2) Compare with the control group, dry matter intake was increased by 9.45% in 60% replacement group (P<0.05), but the milk yield had no significant difference (P>0.05); while milk yield was decreased by 12.05% in 100% replacement group (P<0.05), but the dry matter intake had no significant difference (P>0.05). 3) The percentage of milk composition in experimental groups had no significant change compared with the control group (P>0.05). The net content of milk protein yield was increased by 4.65% in 100% replacement group compared with the control group (P<0.05), but the net content of other milk components were decreased significantly (P<0.05). It is concluded that partly replacement (30% or 60%) of fermented corn stover with alcohol wastewater for whole corn silage in diets has no significant influence on cows’ performance.