芸苔属作物包括块根作物[芜菁(Bra-ssica rapa L.)和芸苔(B.uapus L.)]与块茎作物[芸苔和甘蓝(B.oleraua L.)]早在本世纪初、美国的东部和中西部地区就将芸苔属用作饲料作物、近年在欧洲广泛种植。弗吉尼亚的西部地区在本世纪二十年代,用块根作物饲喂乳牛,发现产奶量与饲喂青贮玉米的乳牛产奶量相似。饲用甜菜比青贮玉米的干物质含量高11%,蛋白质含量 Brassica crops, including tuberous crops [Brassica rapa L. and Brassica L.] and tuber [Brassica and B. oleraua L.] as early as the turn of the century , Brassica is used as a feed crop in the eastern and central western United States and is widely planted in Europe in recent years. In the 1920s, western Virginia fed dairy cattle with root crops and found that the milk yield was similar to that of dairy cows fed silage corn. Feeder beet has 11% more dry matter than silage corn, and protein content