FIG 1.

Flock metadata. Body weights, vaccination timeline, and immune status. Flocks F1 and F2 were raised by the same management during the brood stage (weeks 1 to 5) and separated to two different farms at the grow-out stage (after week 5). (A) Average weights for each flock (F1 in blue, F2 in purple) compared to expected weights for the Hybrid Converter breed (red). Asterisks indicate ages at which bird weights were significantly different between F1 and F2 (P < 0.001). (B) Timing of vaccinations during the sampling period (top) and exact ages and compounds used (bottom). CTC, chlortetracycline. (C) Antibody titers for Newcastle disease virus (NDV), reovirus (REO), hemorrhagic enteritis virus (HEV), and Bordetella avium (BA). Bird ages at sampling are given on the x axes of panels B and C.