Symptoms and treatment of photosensitivity in sheep

Sheep photosensitivity is a disease that causes skin damage due to the presence of photodynamic substances in sheep skin, which causes light-colored skin to react too strongly to the sun.

The expert relieves the disease.

Etiology of ⑴: the disease can be divided into primary photosensitivity and secondary photosensitivity.

Primary photosensitivity: hypericin and buckwheat derived from plants, as well as photoactive substances such as Umbelliferae and Rutaceae, can cause photosensitivity in livestock and poultry. Clover, alfalfa, bovine eight seedlings and brassica are also associated with photosensitivity; some coal tar derivatives such as phenothiazine and sulfonamides and tetracycline can also induce photosensitivity.

Secondary photosensitivity: at present, it is the most common type of photosensitivity in sheep, which is caused by the impaired secretory function of liver and gallbladder and the accumulation of photosensitive substance lycopene (a kind of porphyrin) in plasma. Under normal circumstances, lycopene is absorbed into the blood circulation and effectively secreted into bile through the liver. Liver failure or bile duct damage caused by a variety of reasons (clonorchiasis, plant toxins, phosphorus, carbon tetrachloride, etc.) can lead to the dysfunction of liver secretion of lutein. increase the content of lycopene in blood circulation, so as to reach the skin, absorb and release light energy, and stimulate light damage response.

⑵ symptoms: photosensitive sheep in the sun, will produce photophobia, performance constantly tossing and turning, restless, scratching exposed light-colored skin areas, such as face, ears, eyelids and nose, quickly appear erythema and quickly edema, such as continued exposure to the sun, visible plasma exudation, skin scab necrosis; hepatogenic photosensitivity sheep, can be seen mucosal jaundice.

An expert treats diseases.

Prevention and treatment: sheep that continue to develop photosensitivity should be kept in shade and can only be fed at night. Early injection of corticosteroids or diphenhydramine (40 mg each time) is effective, with 1% potassium permanganate sprayed on the body surface. To reduce exudation, cold compress the affected skin with 2-3% alum water and intravenous injection of 10% calcium gluconate. If the blister has been infected by bacteria, you can use potassium permanganate solution to rinse, apply zinc oxide ointment or anti-inflammatory ointment, and cooperate with penicillin, streptomycin intramuscular injection. In addition, flies should be prevented from harassing.