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作为动物权利组织和科学家之间很少的一次合作 ,美国已参加了一项发展中的世界范围的运动 ,旨在取消半数致死量 (ＬＤ50 )的毒性试验 ,并接受需要少量动物的替代试验方法。动物权利组织估计每年仅在美国约有 5 0 0万只动物用于ＬＤ50 的试验。ＬＤ50实验组一般需要 5 0～ 2 0 0
As a rare partnership between animal rights organizations and scientists, the United States has participated in a developing worldwide campaign to eliminate the LD50 toxicity test and to accept alternative test methods that require small numbers of animals . Animal rights groups estimate that only about 5 million animals in the United States are used for LD50 testing each year. LD50 experimental group generally needs 50 ~ 200