Vitamin A deficiency in ducks occurs mostly in young ducklings and early laying ducks within 50 days of spring. The growth and development of sick ducks was severely hampered, and their weight gain was slow or even ceased. Burnout, weight loss, feathers were unkempt, heavy ducks suffered heavy tears on one side or both eyes, and severe cases suffered subsidence, blindness, and even death. The egg production of diseased ducks decreased significantly, the color of egg yolks faded, the hatching rate was low, and the stillbirth rate increased;
In the spring to prevent duck vitamin A deficiency, it is necessary to provide full-priced compound feeds and supplement feeds rich in vitamin A, such as carrots, spinach, and cod liver oil, but also to do a good job in the transportation, storage and storage of feeds to avoid damaging vitamins due to oxidative rancidity. A. The diseased duck can be treated with cod liver oil, 0.2-0.5 ml each time, 3 times a day, or 1000-1500 international units of vitamin A per kilogram of feed.
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