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Vitamin A Deficiency
Other Names: Roup, Hypovitaminosis A, Follicular Hypeerkeratosis, Phrynoderma, Squamous Cell Hyperplasia
Vitamin A deficiency is most likely to occur in chickens receiving an improper diet, heavily parasitized, or who are suffering from conditions that interfere with normal digestion. Also, vitamin A requirements are higher for chickens under stressful conditions such as abnormal temperatures or exposure to disease conditions.
Chickens with vitamin A deficiency have an increased risk of getting sick. The two main mechanisms involved in the prevention of disease are the effect of vitamin A on the immune system and on epithelial integrity. Vitamin A deficiency also impairs regeneration of normal mucosal epithelium damaged by infection or inflammation and thus can increase the severity of an infectious episode and/or prolong recovery from that episode.
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.
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)