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Vitamin A Deficiency
Roup, Hypovitaminosis A, Follicular Hypeerkeratosis, Phrynoderma, Squamous Cell Hyperplasia
Vitamin A deficiency, otherwise known as hypovitaminosis A, is a common nutritional condition affecting chickens. It occurs as a result of malnutrition, lack of the vitamin in the diet, or as a secondary result from their body's inability to absorb or store vitamin A. Vitamin A deficiency presents as a number of different clinical manifestations, ranging from xerophthalmia (dry eye), uropygial gland infection, impaired growth, and increased susceptibility to severe infection. It affects ocular tissue in two ways: by slowing the regeneration of the visual pigments following exposure to bright light and by disrupting epithelial integrity.
Risk Factors for Vitamin A Deficiency
Malnourished or starved chickens.
Feeding chickens feed which has been stored for longer than 60 days.
Lack of access to fresh forage.
The chicken has an underlying condition that is causing an impairment in vitamin A absorption or storage.
Increase access to green forage and scratching soils for insects, many of which contain high amounts of vitamin A. Purchase smaller quantities of feed so that your not feeding stale food to your flock.
Add vitamin A rich foods to rations
Cod liver oil
Mixed within feed ration at the rate of 2 tablespoons per 5 lb (65 mL per 5 kg), however used sparingly.
Chen F, Jiang Z, Jiang S, Li L, Lin X, Gou Z, Fan Q. Dietary vitamin A supplementation improved reproductive performance by regulating ovarian expression of hormone receptors, caspase-3 and Fas in broiler breeders.. Poult Sci. (2015)