Figure 3.

Change in KLH-specific Ab from pre- to post-KLH challenge during adulthood by young treatment. Birds were grouped by whether they were challenged with KLH or not on days 5 and 28 posthatch. Adult KLH challenge occurred at approximately 3 years of age, and postchallenge measures were assessed 8 days after KLH exposure. There was no difference in anti-KLH Ab levels prechallenge, but males that were exposed to KLH as nestlings (n = 7) mounted a more robust Ab response than males that were not exposed to KLH as nestlings (n = 31).