Technological and Economic Research on the Cow-calf Slaughter System

为了在肉牛生产上取得成功，一些牛犊经营者开始让他们的小牛留在自己的经营中，并将他们完成屠宰。另一方面，一些育肥经营者开始在他们的经营中引入小母牛和奶牛，为自己获得饲喂牛犊。这是牛犊屠宰系统。当奶牛群规模较小时，经营者希望通过饲喂大量精料日粮来提高饲用犊牛的适销性。然而，这些犊牛在育肥系统中并不总是有利可图的，因为过度饲养经常会导致育肥后期的日增重下降。他的矛盾在奶牛-小牛屠宰制度中应该得到改善。最近，在九州、北海道和东北地区有发展牛犊屠宰系统的趋势。我们研究发现，鹿儿岛县的奶牛-小牛屠宰系统比奶牛-小牛或育肥系统更有利可图，因为在他们自己的土地上可以生产用于育肥牛的全作物玉米青贮料。在北海道，我们发现了一个很好的例子，奶牛业采用育肥部分，用小牛犊孵化来饲养新生的小牛，在好的牧场上放牧牛，用全株玉米青贮料饲喂肥育牛。为了有效地建立奶牛-小牛屠宰体系，了解奶牛、小牛和育肥牛的营养需要，并为这些动物准备大量优质的国产饲料是非常重要的。

To be successful in beef cattle production, some cow-calf operators begen to keep their young steer in their own operation and finish them for slaughter. On the other hand, some finishing operators began to introduce heifers and cows into their operations to get feeder calves for themselves. This is cow-calf slaughter system. When herd size of cows is small, operators want to improve marketability of feeder calves by feeding a lot of concentrate ration. However, these calves are not always profitable in finishing system because over-feeding of calves frequently results in depressed daily gain in the latter part of fattening. His contradiction should be improved in cow-calf slaughter system. Recently, there are tendencies to develop cow-calf slaughter system in Kyushu, Hokkaido and Tohoku districts. We studied and found that cow-calf slaughter system in Kagoshima prefecture was more profitable than cow-calf or finishing systems when whole crop corn silage for fattening cattle could be produced in their own land. In Hokkaido, we found a good example where dairy operation adopted fattening section by using calf hatch for rearing new-born calves, by grazing feeder cattle on good pasture and by feeding whole crop corn silage to finish cattle. To establish cow-calf slaughter system efficiently, it is important to understand nutrient requirements for cow, calf and fattening cattle respectively and to prepare much domestic feed of good quality for these animals.