Vitamin A deficiency mostly occurs in young ducklings and early laying ducks within 50 days of spring. Diseased ducks are seriously hindered from growing and growing, and their weight gain is slow or even ceased. Ducklings are tired, debilitated, emaciated, feathery and turbulent, with nostrils flowing viscous fluids, difficulty in breathing, lack of energy, walking cramps, gait and limbs fail to cooperate, and soft palate or even paralysis, with pale yellow in the palate. Severely ill ducks shed tears on one or both eyes. There were cheese-like secretions under the eyelids. The cornea was cloudy and softened, leading to perforation of the cornea and outflow of aqueous humor. Severe eyeball subsidence, blindness, and even death. The Duck egg production decreased significantly, the egg yolk color faded, the hatching rate was low, and the stillbirth rate increased. The duck's sexual function declines. The digestive tract mucous membranes of diseased and dead ducks are swollen and the surface has small, white, sickle-like nodules that are not easily peeled off. The main causes of vitamin A deficiency in ducklings are as follows: Spring ducklings have a single feed, and green feed is insufficient. Feed processing, improper storage, oxidative rancidity and reduced vitamin A content. Farming environmental stress factors increase the need for vitamin A in ducklings. The lack of vitamin A in the diet of female ducks causes vitamin A deficiency in 1-2 week old ducklings. Spring ducks are required to supply full-priced compound feed, pay attention to supply and add vitamin A-rich feed, such as carrots, spinach, pumpkin, green feed and cod liver oil. Do a good job in transportation, storage and storage of feeds to avoid the destruction of vitamin A due to oxidative rancidity. The diseased duck can be treated with color liver oil, 0.2-0.5 ml per gavage each time, 3 times a day. Or add 1000 to 1500 IU vitamin A per kilogram of feed. Individual sick ducklings were intramuscularly injected with 0.5 ml of cod liver oil. The female ducks were fed with 1 to 1.5 ml of cod liver oil daily for 3 times. The curative effect was good.
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