Congenital Thymic Aplasia in a Holstein‐Israeli female Calf

An unusual case of congenital thymic aplasia in a Holstein‐Israeli female calf is described. The most prominent clinical findings were diarrhoea and weakness. At necropsy, the only significant pathological finding was the marked decrease in thymus size. Histologically, this organ was composed of loose connective tissue in which a few lymphocytes were scattered randomly.