Figure 2.

Experiment 2. Lymphocyte proliferation (% increase of mitogen-stimulated cells relative to un-stimulated cells) on y-axis, stimulated by (a) ConA at 5 µg ml⁻¹, (b) LPS at 2.5 µg ml⁻¹ and (c) PMA at 5 µg ml⁻¹ on pigeons fed the 6, 10 and 14% crude protein (CP) diets on x-axis at 4 (black) and 8 (grey) hour incubation after adding alamarBlue® (mean ± s.e., n = 17: 6 and 10%; n = 16: 14%). Different lower-case letters within the same hour indicate significant differences at p < 0.05 using Tukey's post hoc test.