Abstract
Summary
Daily administration of 0.3 to 0.5 g of thiouracil in Brown Leghorn capons and cockerels brought about changes in plumage similar to those observed following thyroidectomy in this breed. Black pigments were replaced by red, barbulation was reduced, and growth rates retarded. Changes in feather color were first apparent 24 to 28 days following initiation of medication and in capons continued for approximately 18 to 20 days after medication ceased.
In a recent note 7 Juhn reported similar modifications of breast feather pattern in the Brown Leghorn capon following thiouracil administration ad libitum by mixing with food. No record was made of observations on growth rate.
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