Cassia tora (Foetid cassia) is the most prevalent weed species in the West African region of Mali. In most parts of Mali, the lack of pasture and forage resources has been a growing problem. C. tora is considered as a poisonous plant. However, the toxic element in C. tora has not been clearly defined. The objectives of our experiment are: to evaluate the chemical characteristics of ensiled vs. fresh C. tora; to investigate the effect of additives on the quality of the ensiled material; to provide feed for the dry season and to examine the effect of the ensiling processes on the toxic chemical (or chemicals) present in the fresh C. tora.