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Sexual dimorphism of upper gastrointestinal motility is not present in neonatal C57BL/6J mice, but develops over time, as measured by the distribution of FITC-dextran 30 minutes after gastric gavage, with testing performed in the morning and after no fasting (2 weeks) or after a short fast (4, 6, 8, and 10 weeks). Bars represent mean ± SD; N = 7 mice per sex per group; FITC = fluorescein isothiocyanate; segment 0 = stomach, 1 = proximal duodenum, 10 = terminal ileum.
