北海道根钏地区是日本主要的草地奶牛业地区之一,在过去十年中该地区草地单位面积的牧草产量并未增加,但同期每头奶牛的产奶量却有较大增长。这是由于增加精料饲喂量所致,牛奶产量的变化正在逐渐依赖于精饲料。但是,饲喂足够的优质粗饲料提高奶牛的个体产奶量要比大量投喂精饲料提高奶牛个体产奶量的经济效益高,据作者调查,在草地的牧草产量高、所养奶牛的粗饲 Hokkaido’s Ginza area is one of Japan’s major grassland dairy farms, with no increase in pasture production per unit of grassland in the area over the past decade, but there has been a significant increase in milk production per cow over the same period. This is due to the increased concentrate feed, which is increasingly dependent on concentrate feed. However, feeding enough high-quality roughage to raise the individual milk yield of dairy cows is more cost-effective than increasing the amount of concentrate fed to increase individual cows’ milk production. According to the authors, the herbage yield in the grassland is high,