Department of Animal Science, Macdonald Campus, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada.
J Dairy Sci. 2010 Dec;93(12):5921-5. doi: 10.3168/jds.2010-3279.
Twenty Holstein cows were used in a randomized complete block experiment to determine the feeding value of pearl millet silage (MS) for dairy cows relative to corn silage (CS). Two isonitrogenous diets were formulated with a 53:47 forage:concentrate ratio. Pearl millet silage and CS comprised 67% of the forages in each diet. Relative to CS, MS contained higher crude protein (13.0 vs. 9.4%), neutral detergent fiber (66.9 vs. 40.7%), and acid detergent fiber (38.8 vs. 23.9%). Dietary treatments had no effect on dry matter (average = 23.9 kg/d) or crude protein (average = 4.2 kg/d) intake. However, cows fed MS consumed more neutral detergent fiber (9.7 vs. 8.3 kg/d) than did cows fed CS. Silage type had no effect on milk yield (average 38.0 kg/d), whereas energy-corrected milk (43.8 vs. 38.6) and 4% fat-corrected milk (41.8 vs. 35.5 kg/d) were greater for cows fed MS than for those fed CS. Milk protein, lactose, and total solids concentrations were not influenced by dietary treatments. However, cows fed MS produced milk with a greater milk fat concentration (4.17 vs. 3.78%) than did cows fed CS. We concluded that MS, when compared with CS, had a similar effect on feed intake, milk yield, and milk efficiency. Because of increased milk fat concentration, cows fed MS produced more energy-corrected milk than did cows fed CS.
二十头荷斯坦奶牛采用随机完全区组试验设计，旨在确定相对于玉米青贮（CS）而言，珍珠粟青贮（MS）对奶牛的饲用价值。设计了两种等氮日粮，粗饲料：精料比为 53:47。两种日粮中，MS 和 CS 各占粗饲料的 67%。与 CS 相比，MS 含有更高的粗蛋白（13.0%比 9.4%）、中性洗涤纤维（66.9%比 40.7%）和酸性洗涤纤维（38.8%比 23.9%）。饲粮处理对干物质（平均 23.9kg/d）或粗蛋白（平均 4.2kg/d）的摄入量没有影响。然而，饲喂 MS 的奶牛比饲喂 CS 的奶牛消耗更多的中性洗涤纤维（9.7kg/d 比 8.3kg/d）。青贮类型对产奶量（平均 38.0kg/d）没有影响，而能量校正奶（43.8kg/d 比 38.6kg/d）和 4%脂肪校正奶（41.8kg/d 比 35.5kg/d）饲喂 MS 的奶牛比饲喂 CS 的奶牛更高。饲粮处理对牛奶蛋白、乳糖和总固形物浓度没有影响。然而，饲喂 MS 的奶牛所产牛奶的乳脂浓度更高（4.17%比 3.78%）。我们得出结论，与 CS 相比，MS 对采食量、产奶量和产奶效率有相似的影响。由于乳脂浓度增加，饲喂 MS 的奶牛比饲喂 CS 的奶牛生产的能量校正奶更多。
