Bloat and redgut disease
Like other clovers, bur clover is reported to cause bloat, especially after lush growth and with animals that are not accustomed to grazing it (USDA NRCS, 2002). In sheep, bur clover occasionally causes red gut, an enlargement of the large intestine due to highly digestible feeds. To cope with enlargement the intestine twists and may become obstructed, resulting in sudden death (Howie et al., 2007; Gumbrell, 1997).
Photosensitisation
Bur clover can cause photosensitisation in horses (Howie et al., 2007).
Reproduction disorders
Like alfalfa, bur clover contains phytoestrogens/coumestrol that can have negative effects on the reproduction of grazing livestock, though this is rarely reported. Levels of phytoestrogens/coumestrol tend to be higher under conditions of phosphorus deficiency and fungal infection (Howie et al., 2007; Fuller, 2004).