The concentrations of pIgG (g/L) in the four diets were 73.5 (PC), 0.0 (BC), 0.8 (PM) and 29.7 (PP). Analyzed across the three sample times at 6–12 h after the first meal, the plasma pIgG level was significantly elevated in PC vs. PM and PP pigs (Fig. 1A). The level of pIgG measured in the two last-mentioned groups (1–3 g/L), however, remained significantly higher than the level in BC pigs (0.3 g/L)