据国外资料报导,猪的日粮中含硒量低于0.02PPm或0.06PPm,同时缺乏维生素E时即发生缺硒症;鸡的日粮中维生素E供应正常、硒的含量不低于0.02PPm或日粮含硒为0.08PPm时可防止缺硒症。1979年美国NRC提出,猪日粮硒的需要量为0.15PPm,但日粮含硒超过5.0PPm时可能中毒。一般来说,某一地区所生产的饲料、饲草含硒量低于0.05PPm即属严重缺硒区。 According to foreign data reported that the pig’s dietary selenium content of less than 0.02PPm or 0.06PPm, while the lack of vitamin E when selenium deficiency occurs; chicken dietary vitamin E supply is normal, selenium content of not less than 0.02PPm Or diet containing selenium 0.08PPm to prevent selenium deficiency. In 1979, the United States NRC proposed that the requirement for selenium in pigs should be 0.15PPm, but it may be toxic if the diet contains more than 5.0ppm selenium. In general, the production of feed in a particular area, forage selenium less than 0.05PPm that is a serious lack of selenium area.