Clark P W, Kelm S, Endres M I
Department of Animal & Food Science, University of Wisconsin-River Falls, 54022-5001, USA.
J Dairy Sci. 2002 Mar;85(3):607-12. doi: 10.3168/jds.S0022-0302(02)74114-3.
A leafy corn hybrid was compared to a grain corn hybrid as silage and high moisture grain to evaluate dry matter intake, milk yield, and milk composition. Sixteen multiparous Holstein cows averaging 97 DIM were used in a feeding trial based on 4 x 4 Latin squares with 21-d periods. Each of four diets contained (dry basis) 8% chopped hay, 42% corn silage, 11% high moisture corn grain, 10% whole, fuzzy cottonseed, and 29% protein concentrate. One diet used leafy corn as both high moisture grain and silage. A second diet contained grain corn hybrid (control) as both high moisture grain and silage. A third diet contained leafy corn for high moisture grain and control corn for silage and the fourth diet used control corn for high moisture grain and leafy corn for silage. Cows fed diets containing leafy silage produced more milk and milk protein and ate more DM than cows fed control silage. The corn hybrid used for high moisture grain did not influence milk yield or composition. Dry matter intake was greater for cows fed the diet containing both leafy high moisture grain and leafy silage than for cows fed both control high moisture grain and control silage, but milk yield and composition were not different. When fed as silage, the leafy corn hybrid used in this experiment supported greater DMI as well as higher milk and protein yields when compared to the grain corn hybrid.
将一种多叶玉米杂交种与一种谷物玉米杂交种作为青贮饲料和高水分谷物进行比较，以评估干物质摄入量、产奶量和牛奶成分。在一项基于4×4拉丁方、为期21天的饲养试验中，使用了16头平均产犊间隔97天的经产荷斯坦奶牛。四种日粮中的每一种（干基）都含有8%的切碎干草、42%的玉米青贮、11%的高水分玉米籽粒、10%的带绒棉籽和29%的蛋白质浓缩料。一种日粮使用多叶玉米作为高水分谷物和青贮饲料。第二种日粮含有谷物玉米杂交种（对照）作为高水分谷物和青贮饲料。第三种日粮使用多叶玉米作为高水分谷物，对照玉米作为青贮饲料，第四种日粮使用对照玉米作为高水分谷物，多叶玉米作为青贮饲料。饲喂含多叶青贮饲料日粮的奶牛比饲喂对照青贮饲料的奶牛产奶量和乳蛋白更多，干物质采食量也更大。用于高水分谷物的玉米杂交种对产奶量或成分没有影响。饲喂含多叶高水分谷物和多叶青贮饲料日粮的奶牛的干物质摄入量高于饲喂对照高水分谷物和对照青贮饲料的奶牛，但产奶量和成分没有差异。在本试验中，与谷物玉米杂交种相比，当作为青贮饲料饲喂时，多叶玉米杂交种能支持更高的干物质采食量以及更高的产奶量和蛋白质产量。
