Photosensitivity in Livestock
Photosensitivity in livestock can be a major problem. Not only can it cause pain and discomfort but it may even result in production loss and in severe cases death.
Photosensitivity is an abnormal skin reaction to direct sunlight exposure. This condition is not the same as sunburn.
Photosensitivity causes skin to become very susceptible to ultraviolet rays. When light penetrates the affected skin it kills cells and causes swelling, itching and may perhaps even patches of skin to slough off. Severe damage can occur when unpigmented skin that is unprotected from the sunlight becomes sensitized.
Photosensitivity is due to the accumulation of photosensitive compounds beneath the skin. It usually occurs in herbivorous or omnivorous and is often due to the ingestion of harmful plants that create liver damage. Most commonly white-faced or white animals with unpigmented skin that is exposed to sunlight, such as skin occurring on the animal’s face, back or udder, are most affected. However colored livestock can also experience photosensitivity.
