Effect of feeding on plasma secretin concentrations in sheep

Changes in plasma secretin concentration during the 24 hours after feeding were observed in five female sheep fed 1500 g of lucerne pellets and 300 g of orchard grass hay once daily. The pre-feeding concentration of plasma secretin was 50 +/- 9 pg ml-1. The plasma secretin concentration began to increase immediately after the beginning of feeding, reached values approximately double the pre-feeding values six hours after feeding, and remained significantly above the pre-feeding value for more than 10 hours after feeding (P less than 0.01 or less than 0.05).