Apparent energetic efficiency of jejunal glucose uptake in young adult turkeys selected for rapid growth

A rapid growth line (F) and a randombred control line (RBC2) of 16-wk-old u nsexed turkeys were used to examine the effect of genetic selection for rap id growth on jejunal O-2 consumption, glucose uptake and apparent energetic efficiency of glucose uptake. F line had 85% greater feed-deprived body we ight (FBW, kilogram) than RBC2 line (P < 0.001) at 16 wk of age and a light er (gram/kilogram FEW) and shorter (centimeter/kilogram FEW) small intestin e and jejunum (P < 0.001). Additionally, the jejunum was composed of a high er proportion (P < 0.007) of mucosal tissue. There was no difference betwee n the lines in apparent energetic efficiency (nmoles ATP expended/nmoles gl ucose uptake) of jejunal active glucose uptake. These data suggest selectio n for rapid growth in turkeys does not result in more efficient glucose upt ake from the jejunum.