Mean Bt toxin concentrations (ng/mL) in gastrointestinal digesta of pigs fed Bt and isogenic maize1.

1Values in parentheses correspond to the percentage of pigs within each treatment that tested positive for the Bt toxin.2Isogenic: isogenic maize diet for 110 days.3Bt: Bt maize diet for 110 days.4Isogenic/Bt: isogenic maize diet for 30 days followed by Bt maize diet for 80 days.5Bt/isogenic: Bt maize diet for 30 days followed by isogenic maize diet for 80 days.6BLD – below the limit of detection (stomach; 0.82 ng/mL, cecum; 2.16 ng/mL, colon; 1.48 ng/mL).