Hepatogenous Photosensitization in a Neonatal Calf Raised on Brachiaria Decumbens Pasture

This study reports a case of hepatogenic photosensitization in a 22-day-old lactating Tabapuã calf raised on Brachiaria decumbens pasture, which contains lithogenic saponins that can induce liver damage. The calf exhibited symptoms such as skin erythema, alopecia, corneal ulcers, and diarrhea. Diagnosis was confirmed through clinical signs and response to treatment, which included removing the calf and its mother from the pasture and sunlight, and administering vitamins, anti-inflammatory drugs, antibiotics, and ophthalmic treatments. After 54 days, the calf showed complete remission with significant hair regrowth. The study highlights the importance of early diagnosis and intervention, and suggests preventive measures like dietary changes and avoiding high-saponin pastures to manage and prevent the condition.