Using transgenic rice harboring Xa21 gene,toxicity experiments for ICR mice and SD rats, and 90-day feeding tests for SD rats were conducted.The results showed that oral LD_(50) for ICR mice and SD rats was larger than 20g/kg and no toxicity was found.The SD rat groups fcd with 16,32,64g/kg-dosagc of transgenic rice had good development in 90-day feeding test.No obvious differences were found in the index of weight,food utilization rate,routine blood lest,items of blood biochemistry and ratio of organ to bo...