Vitamin A can promote the growth of layer chickens, maintain the high yield of laying hens and the quality of eggs, and increase the hatching rate. In the absence of vitamin A, laying hens can cause swollen heads, decreased egg production, and even death.
Symptoms The diseased chicken has loose plumage, difficulties in standing, eyes sticking, tears in the eyes, and watery secretions in the nostrils. The eggs produced are also significantly smaller, the eggshell is rough and matt, and the egg yolk is only half the normal size. The egg production rate dropped from 60% to about 20%. Some chicken eyes have milky white discharge and are blind. The diseased chicken gradually became thin and even died.
To prevent the laying hens from eating green feed, it is necessary to ensure that sufficient premixes of vitamin A are added, and 1500 IU of vitamin A is added per kilogram of feed during the growth phase to ensure that the hens feed 300-330 IU per day. unit. Synthetic antioxidants are added to the full price feed to prevent oxidation loss during storage of Vitamin A.
Treatment for chickens that have already developed can be cured by adding a therapeutic dose of feed. Add 5000 international units of vitamin A per kilogram of feed. The course of treatment is 1 month. In the group treatment, cod liver oil was used for 1%-2% compounding and was fed for 5 days to be curable. For symptomatic heavy laying hens, each diseased chicken was treated with 1/4 spoon of cod liver oil three times a day.
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