Gastrointestinal tract morphology is shown in
Table 4. The relative PRW was 13.9% and 71.2%
greater (P < 0.05) in D+ birds than in RL birds at 7
and 21 d, respectively, but the difference did not persist
at 53 d. D- birds presented intermediate values at all
ages. Relative gizzard weight was greater in D+ birds
than in RL at all ages. Relative gizzard weight was also