TABLE 1.

Histometric measurements of the bursa of Fabricius at different ages^a

Age (days)	Mean cortical area of the BF (μm2) ± SE	Mean nodular area of the BF (μm2) ± SE	Mean medullary area of the BF (μm2) ± SE
1	6,031 ± 682 D	13,436 ± 1,617 G	8,120.4 ± 1,130 D
9	14,689 ± 1,617 C	51,530.18 ± 5,679 E	17,776.5 ± 969 C
49	77,702 ± 4,823 A	153,084.9 ± 11,744 C	59,027.6 ± 6,102 A
70	61,355 ± 9,769 A	159,796.8 ± 12,891 C	54,109.6 ± 8,894 A
112	61,457 ± 5,472 A	160,555.5 ± 7,088 C	49,830.8 ± 4,598 A
140	—	68,422.8 ± 5,610 B	—
154	—	25,629.1 ± 1,839 A	—

^aData are means ± standard errors (n = 6). Different letters in the same column indicate significant differences (P < 0.05). —, unmeasurable.