Contents of Cr, Yb, and Co in the samples were determined by atomic absorption spectrophotometry according to the AOAC (1990). Calculations and Statistical Analyses Flows of DM to the duodenum and DM excreted in feces were calculated by dividing Yb infused (grams of Yb per day) by Yb concentration (grams of Yb per kilogram of DM) in the duodenal digesta or feces, respectively. Flows of other nutrients to the duodenum or feces were calculated by multiplying DM flow by their concentration in duodenal or fecal DM.
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