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在国外养牛业中,乳牛总头数在100头以上的牧场日益增多,这就要求从实质改变传统的饲料加工工艺。在荷兰冬干草的加工量,从74％减少到41％,而青贮饲料却从26％增长到了59％。60年代初,那里的青贮饲料基本上是在作物刚一刈下就立即进行加工。1975年,加工91％的青贮饲料,其干物质含量都很高(平均为27.3％)。青料在地里靠太阳晒蔫。用这种青贮饲料喂乳牛,一昼夜的干物质需要量为11—12公斤,即与一份干草日粮等价。用晒蔫的原料制作的青贮饲料中,粗蛋白质含量比较高(相应地为14.8％,12.6％),
In the foreign cattle industry, the increasing number of dairy farms with more than 100 heads of livestock requires the substantial change of the traditional feed processing technology. The processing of winter hay in the Netherlands decreased from 74% to 41%, while silage increased from 26% to 59%. In the early 1960s, silage there was basically processed immediately after the crop was mowed. In 1975, 91% of processed silage had high dry matter content (an average of 27.3%). Green material in the sun by the sun. Dairy cows fed this silage have a dry matter requirement of 11-12 kg for a day and night, which is equivalent to a hay ration. In silage made from sun dried raw materials, the crude protein content is relatively high (correspondingly 14.8%, 12.6%),