Effect of a 7 d course of daily saline (CONT) or corticosterone at dose of 5 mg/kg BW (CORT) injections on the relative weights of liver (A), thymus (B), bursa (C) and spleen (D) to the body weights of broiler chickens during the treatment course (0, 3 and 7 d after the start of injection; 21, 24 and 28 d of age) and one week after cessation of the treatment (14 d after the start of injection; 35 d of age).

Bars express the mean ± SEM (n = 5). Bars of CONT and CORT groups, within each time of the treatment course, with different letters (a, b) are significantly different at P<0.05.