Intravenous glucose tolerance tests (IVGTT). Plasma glucose and insulin concentrations and respective AUC values during IVGTT on day 7 (A, B) and on day 14 (C, D) in FORM, IEN, CEN, and PN pigs. Results are expressed as mean ± SEM; n = 5–8 per group;abcd different from PN, CEN, IEN, and FORM, respectively; P < .05. CEN, continuous enteral nutrition; FORM, intermittent formula feeding; IEN, intermittent enteral nutrition; PN, parenteral nutrition.