Protein And Amino Acids Deficiency

The optimal level of balanced protein intake changes according to age; for growing chicks it is ~18-23% of the diet; for growing poults and gallinaceous upland game birds, ~26-30%; and for growing ducklings and goslings, ~20-22%. If the protein and component amino acid content of the diet is below these levels, birds tend to grow more slowly. Even when a diet contains the recommended quantities of protein, satisfactory growth also requires sufficient quantities and proper balance of all the essential amino acids.

Few specific signs are associated with a deficiency of the various amino acids, except for a peculiar cup-shaped appearance of the feathers in chickens with arginine deficiency and loss of pigment in some of the wing feathers in bronze turkeys with lysine deficiency. All deficiencies of essential amino acids result in retarded growth or reduced egg size or egg production. Some deficiencies or even imbalances of amino acids may be related to management problems such as hysteria, “pickouts” and “blowouts,” and fatty liver syndrome.
 
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