A morpho-histologic study of the thymus and of the bursa Fabricii of young chicks (Wyandotte race) following experimental treatments was aim of the present research. The chicks were: 1) totally irradiated; 2) irradiated with shielded thymus; 3) irradiated with shielded bursa. A remarkable difference in X-ray-sensitivity and recovery between thymic and bursal lymphocytes was put into evidence. Moreover it was observed that thymus-shielding influences the percentage of picnotic lymphocytes in the bursa and their presence along the period of time considered in the experiment. The shielding of the bursa results in an enhanced mitotic activity of its lymphocytes; the thymus of these animals shows a mitotic index corresponding to that of control chicks.
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Con il contributo del Ministero per i Beni e le Attività Culturali