Vitamin A deficiency mostly occurs in young ducklings and early egg-laying ducks within 50 days of spring. The diseased ducks are seriously impeded from growth and development, and their weight gain is slow or even stagnant. They are tired, weak, thin, feathery, and have nostrils flowing out of viscous liquids. Difficulty in breathing, difficulty in exercising, walking cramps, then soft palate, yellow lightening in the palate. Severely ill ducks shed tears on one or both eyes, and there were cheese-like secretions under the eyelids. The cornea became cloudy and softened, leading to perforation of the cornea and anterior aqueous humor flow, severe eyeball 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;
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, storage is improper, and oxidative rancidity causes a decrease in vitamin A content; breeding environmental stress factors increase the number of young ducks The amount of vitamin A required; the lack of vitamin A in the breeding duck diet caused vitamin A deficiency in 1-2 week old ducklings.
Spring ducks are required to supply full-priced compound feeds to supplement feeds rich in vitamin A, such as carrots, spinach, squash, and cod liver oil. We must do a good job in the transportation, storage and storage of feeds to avoid the destruction of vitamin A due to oxidative rancidity. Sick ducks can be treated with cod liver oil, 0.2-0.5 ml per gavage each time, 3 times a day. Or add 1000-1500 international units of vitamin A per kilo of feed. For individual ducklings, 0.5 ml cod liver oil can be intramuscularly injected. The female ducks are fed with 1 to 1.5 ml of cod liver oil daily for 3 times, and the curative effect is better.
Substitute tea refers to the use of edible plant leaves, flowers, fruits (fruit), roots, etc., using the way of drinking tea (by brewing, boiling, etc.) is a kind of products commonly known.
Substitute tea is divided into leaf, flower, fruit and rhizome; The way of drinking the same as tea is generally composed of one or more items in the two categories of "medicine and food homology" and "can be used for health care" in the food classification stipulated by the Ministry of Health. Tea products made from the roots, stems, leaves or fruits of these plants.
The way of drinking the same as tea, generally by the ministry of Health provisions of food classification of medicine and food homologous category, can be used for health care category, two types of goods in the single or multiple items, with the roots, stems, leaves or fruits of these plants made of tea products.
Substitute tea has certain effect and auxiliary effect for some special groups, belonging to the health conditioning products.
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