During the rearing process, meat ducks are often prone to metabolic diseases with visual and motor impairments as the main symptoms - vitamin A deficiency. Incidence. Vitamin A deficiency occurs frequently in meat ducks, followed by both meat and eggs, and rarely in duck eggs. Symptoms usually appear at 6 to 7 weeks of age in ducks, but there are symptoms at 1 week of age. The characteristic symptom of sick ducks is that the eyes flow out of a milky exudate, the upper and lower eyelids are bound by the exudate, and the conjunctiva of the eye is cloudy and opaque. In severe cases, a large chunk of white cheese-like material accumulates in the eye, and the cornea even softens and perforates, eventually causing blindness. The diseased ducks have stagnated, their spirits are wilted, their bodies are thin, their walks are unstable, their feathers are loose, their skin yellow disappears, their movements are weak, and their legs are paralysed. Pigs with visual and motor impairments will die if they are not treated. The necropsy results. The disease is characterized by the formation of a white nodule on the mucosal surfaces of the nasal passages, mouth, throat, esophagus, and hernia sac, which is difficult to detect with the naked eye. The large diameter is up to 2 mm, and the number is large. In severe cases, the nodules are enlarged and often merge into a gray pseudomembrane covering the mucosal surface. Due to the damage of mucous membranes, pathogenic microorganisms such as bacteria and viruses can easily invade and cause secondary infections. Prevention methods. Prevention is more important than treatment, and it is necessary to pay attention to the diversification of feedstuffs at ordinary times, and it is indispensable for green feed or poultry multidimensional factors. According to the season and feeding conditions, carrots and carrots were the best for winter and spring, followed by legume green leaves, such as alfalfa, clover, milk vetch, and broad bean seedlings. In the summer and autumn seasons, wild plants such as Vallisneria are the best, followed by green vegetables and pumpkins. Once a diseased duck suffering from vitamin A deficiency is found, a feed rich in vitamin A should be added to the diet as soon as possible, and the ratio of yellow corn can be increased in the compounded material, and the green feed is even more unstoppable. It must be noted that vitamin A is a fat-soluble and unstable substance that can easily be oxidized during feed processing, preparation, and storage. The higher the temperature is, the more likely it is to fail. Therefore, rancidity, fermentation, and production of feed should be prevented. heat. The veterinary drug market is not easy to buy because of simple vitamin A preparations, and it is generally fed with clear fish liver oil. Individual treatment, each duck fed 2 ml each time; or vitamin A, D capsules, each pill contains vitamin A3000 international units and vitamin D300 international units, each duck fed 1 pill each, are a day feed 3 Times. Other vitamin A preparations include cod liver oil drops, milk white cod liver oil, and wheat fine cod liver oil. Although they may also be used, they are not economical. The group treated ducks with vitamin A deficiency and was treated with an intramuscular cleansing cod liver oil for emergency treatment. A young duck with a body weight of 250 g or more could be intramuscularly injected with 1 ml of the fish. Can also add cod liver oil 20 ml per kilogram of concentrate feed. Vitamin A can be rapidly absorbed in the body and symptoms of the diseased ducks will soon disappear.
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