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Plasma cortisol concentration in weaned piglets. Piglets were born to sows fed adequate (AP, 12.1%), low (LP, 6.5%) and high (HP, 30%) protein levels throughout gestation. Blood samples were taken before (D27) and after weaning (D29). Data are expressed as LS-means + SE (AP, n = 20; LP, n = 17; HP, n = 20). Significant differences between diet groups are indicated by asterisk (* P < 0.05; Tukey-Kramer test).
