The dioxin levels in local pastures are also much higher than those found in imported grass varieties , such as alfalfa hay , bermuda grass and oat grass , which contain less than 0 . 3 ng / kg of dioxin , according to the study 根據(jù)這份研究,本地牧草的戴奧辛含量也高出進(jìn)口牧草許多,像是苜蓿、百慕達(dá)草、燕麥草等進(jìn)口牧草的戴奧辛含量多在0 . 3奈克公斤以下。