These findings are consistent with lowacetyl-CoA synthetase activity and limited utilizationof acetate by ruminant liver (17).In hepatocytesisolated from castrated male goats,1.25 and 2.5 mM butyrate decreased (P<.01)[14C]glucose production from [2-14C]propionateto 62 and 58% of control (Figure lb), similar toprevious data (2).Using calf hepatocytes underidentical experimental conditions, butyrate decreased(P<.01) [laC]glucose production to 32and 37% of control Figure lb).There were nodifferences between the effect of 1.25 vs. 2.5mM butyrate and no species x butyrate interaction.To eliminate one possible explanation forwhy butyrate, but no other VFA, inhibits gluconeogenesisfrom propionate in vitro, rates ofVFA uptake were determined.Rates of propionateuptake by goat hepatocytes (Figure 2) aresimilar to those reported for sheep hepatocytes(8). When VFA are incubated individually (Figure3), rates of uptake are propionate > valerate> isovalerate > butyrate.
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