Figure 5.

Free cortisol index (FCI) in samples collected immediately prior to weaning (day 0), and on days 1 and d 3 postweaning in pigs nursed by sows receiving a corn-soybean meal based diet supplemented with 1% protected fish oil (1% PFO, n = 16 pigs; Gromega, JBS United Inc., Sheridan, IN) or no supplement (0% PFO, n = 16 pigs) 1 wk prior to farrowing until day of weaning (31 ± 2 d of age). The FCI was calculated by dividing plasma cortisol concentrations (nmol/L) by corticosteroid-binding globulin concentrations at each day sampled. ^a-dMeans ± SEM with different letters differ by diet (P = 0.02), day (P < 0.001), and diet x day (P = 0.01).