Photosensitization
Cases of photosensitization have been recorded with Congo grass, though less frequently than with signal grass. Mortality rates reached 20-60% in light-skinned sheep grazing pastures dominated by Congo grass in 1980 and 1981. The sheep developed generalized necrosis and severe icterus (jaundice) (Pierre, 1984). In Brazil, outbreaks of hepatogenous photosensitization of sheep have been recorded (Nazario et al., 1985 cited by Riet-Correa et al., 2011; Purchio et al., 1988).