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Plasma concentrations of GH were high in young birds (2–12 weeks old) and low in older birds (15 and 18 weeks old) in the control Cornell K strain of White Leghorn fowl. There was little variation in the plasma concentrations of tri-iodothyronine (T₃) and thyroxine (T₄) with age in this strain. Similar patterns of plasma hormone concentrations with age were observed in autosomal recessive dwarf chickens. However, the plasma concentrations of T₃ and T₄ tended to be depressed while that of GH was raised. There was little age-related change in the plasma concentrations of GH, T₃ and T₄ in sex-linked recessive dwarf chickens. Throughout growth and maturation the plasma concentrations of T₃ in the sex-linked dwarf birds were less than 40% of those observed in the control strain. Plasma concentrations of T₄ tended to be raised relative to the control in the sex-linked dwarf at each age examined. The plasma concentration of GH was raised only in older (12, 15 and 18 weeks old) sex-linked dwarfs. Liver T₄-5'monodeiodinase activity was slightly depressed in autosomal dwarf chickens and very low in the sex-linked dwarf fowl. Neither autosomal nor sex-linked dwarfism appears to be due to hypopituitarism. It is probable that the depressed liver 5'monodeiodinase activity and the concomitant low plasma concentrations of T₃ are a causative factor in the reduced growth and stature of the sex-linked dwarf chicken.

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