Chicken crown disease
The crown eel, also known as jaundice, is a fungal skin disease in chickens. It is characterized by a yellowish-white, scale-like pupa that forms on the hairless part of the head, especially on the flesh of the comb. (I) Etiology The pathogen of crown gall is Microsporum gallinae, Trichophyton gallinae, which is also a mold. The hyphae are long-branched, and the major conidia are elliptic. Most of them are 4-6 cells. There are many small conidia and single cells, which are rod-shaped or pear-shaped. (b) Epidemiology This disease is more common in the summer, mainly through skin wounds (such as mosquito bites, abrasions, etc.) infection, chickens can directly contact each other and spread gradually. Overcrowding and poor sanitation in the flock can make the disease more likely to occur and develop. The disease mainly occurs in chickens, and chickens of all ages can infect. Artificial vaccinations in laboratories can occur, and there are occasional reports of infection. (c) Clinical pathology and pathological changes It started with a grayish white spot on the top of the cocks, with scales on the surface, as if it were sprinkled flour. Later gradually expanded to the entire crown, meat, around the eyes and the hairless part of the head skin, the entire surface of the cocks covered with a gray pimple. As the disease progresses, the scales deposited on the skin thicken to form a crusted surface. The lesions may also spread to the skin on the hairy parts of the body, causing the feathers to fall off in patches, thickening the skin and covering the above scales and crusts. In some serious cases, germs can also invade internal organs and form a kind of necrotic nodules and pale yellow cheese-like deposits on the upper respiratory mucosa. Occasionally, it may also occur in bronchus and lungs, and even cause sac and small intestine mucosa. Necrotic inflammation. When the disease is severe, due to the itching of the skin, the diseased chicken is uneasy, the spirit is frustrated, debilitated, and weight loss occurs. The hen's egg production is reduced. (d) Diagnosis According to the local lesions of the head of the diseased chicken, diagnosis can be made. If necessary, the material can be examined with a microscope to observe the mycelia and spores of the mold, and the mold can be isolated and cultured, and the diagnosis can be confirmed. (five) control Chicken farms, especially breeder farms, should always pay attention to inspections, where any diseased chickens are found, heavy ones are eliminated immediately, and light isolation treatment is used. Diseased chicken skin and scales can spread diseases, so the house floor and utensils must be thoroughly cleaned and disinfected. At the same time, we must improve the hygienic condition of the flock. For individual treatments, the scabs of the diseased cockscomb and meat carcasses are first soaked in soapy water and then stripped. After drying, they are topically coated with iodine, iodine, 10% salicylic acid ointment or 2% formalin solution. , all have a certain effect. In addition, formalin cream (formulation: 1 part of formaldehyde, 20 parts of Vaseline, shaking after the water bath is melted, stir, and immediately after solidification of vaseline) can be applied to the skin of the affected part, and the effect is good.
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