Symptoms: decreased appetite, impaired digestion, diarrhea, anemia, growth and development stopped. Skin keratosis or moderate keratinization. The skin under the abdomen, the inside of the thigh, the thighs and the back presents a marked erythema, which develops into a papule from the erythema. The epidermis becomes thicker and the crust is a few centimeters long. This lesion can be extended to most of the sick pigs. Large areas, some expanded to all body surface, and distributed symmetrically. The lesion is about 5 to 7 mm thick and is nominally dry and rough. This pathological process lasts about 2-3 weeks, and it is difficult to heal if there is trauma. In some cases, there are suppurative lesions under the skin, and some have large hair loss and mild itching. Piglets have smaller femurs and reduced toughness. The sow's litter size is reduced and the boar semen quality is lowered. In addition to the characteristic changes of the skin, the internal organs of the disease do not have characteristic changes. The skin of the lesion is thickened and it is difficult to cut.
Treatment: To adjust the diet structure, increase enough zinc, high calcium in the diet to reduce calcium. Intramuscular injection of zinc carbonate, 2 to 4 mg per kilogram of body weight, once a day, 10 days for a course of treatment, a normal course of treatment can be effective. Oral administration of zinc sulfate 0.2 ~ 0.5 g / head, the skin keratosis can be effective in a few days, can heal after a few weeks; the diet participates in 0.02% zinc sulfate, zinc carbonate, zinc oxide. A 10% zinc oxide ointment can be applied to skin lesions.
Note: In order to ensure sufficient zinc in the diet, the calcium content should be properly limited. The ratio of normal calcium to zinc is 100:1. When the calcium of the pig diet is 0.4%-0.6%, the zinc should reach 50-60 mg. /kg to meet their nutrient needs.
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