Effects of <i>Cryptomeria japonica</i> bark on circadian variations in lymphocytes and neutrophils in sheep

Abstract

The effect of bark from Cryptomeria japonica trees on circadian variations in lymphocyte and neutrophil counts in sheep was studied. Hay supplemented with bark caused decreased leukocyte counts in peripheral blood compared with hay alone. Percentages of lymphocytes were slightly increased, and neutrophils were slightly decreased compared to controls. Plasma NEFA concentrations with bark and hay were also lower than those with hay alone. These results suggest that feed supplemented with bark may increase parasympathetic activity in sheep.