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Metabolic infusion protocol. Animals were acclimated to food availability between 0800 and 1600 h. Blood was drawn through the tether system catheter periodically during the day and night. Stable isotope infusions were performed starting at 2300 h and continued until 0700 h. Isotope infusion and blood drawing occurred through the tether catheter. For details of feeding and animal management protocols, see Materials and Methods.
