When cattle were grazed in the spring pasture following the stall feeding, they would suffer marked change of environment or intaked feed. Assuming that some physiological disturbance may occur in cattle grazing young growing plant in spring pasture, in this report were studied the effect of grazing on bloodserum total nitrogen and noh-nitrgen content with 10 grazing cattle during two periods.
The blood-serum total nitrogen level did not show any distinctive change with grazing, and non-protein nitrogen content showed very wide variation in individual or day to day but could not find any significant tendency.
In conclusion, it seems that on our pasture experimental grazed cattle were not suffered any marked effect in respect of these blood nitrogen compositions.