Senecio, more commonly known as ragwort, gifbossie or dunsiekte bossie is the name given to the toxic plant common in paddocks, that has yellow, daisy-like flowers.
It is highly toxic to horses but is difficult to identify, since there are at least five different species in South Africa . The toxic principle is a pyrrolizidine alkaloid and can affect the intestinal and neurologic system, the liver and skin.
Intestinal (Acute): colic and severe diarrhoea
Liver (Chronic): weight loss, depression, colic, diarrhoea, icterus, dark coloured urine
Neurologic (Chronic): depression, yawning, aimless wondering, head pressing, draggin hooves, difficulty swallowing, blindness, circling, abnormal gait, coma.
Skin (Chronic): photosensitivity (sensitivity to the sun), skin inflammation, itching, hair loss
All parts of the plant may be toxic.