Table 2.

Bursa lesion score, three or two chickens sampled each time at various ages.

Age In days	Group 1	Group 2	Group 3	Group 4
28	1,4,2	1,2,3	4,4,4	3,4,4
29	4,3,2	4,2,1	4,4,4	4,4,1
30	4,1,2	2,3,4	3,4,4	1,3,3
31	1,1,1	1,1,4	3,1,4	2,4,3
36	1,2,1	1,2,1	4,1,1	2,4,1
38	1,1,1	4,4,1	1,1,4	1,1,2
42	1,1,2	1,4,2	1,4,4	3,1,4
44	1,1	2,2,2	1,1	1,2

When bursa lesions involved 1–25% of the follicles, a value of 1 was assigned, 26–50% of follicles a value of 2 was assigned, 51–75% of follicles a value of 3 was assigned, and 76–100% of follicles a value of 4 was assigned.