1963 Volume 16 Issue 4 Pages 132-135,140
In order to find out actual influences of various environmental factors upon the healthy dog, it is important to observe diurnal changes, including those in the period of pregnancy and lactation, in such factors. In this study, diurnal changes in blood constituents and serum calcium were chiefly examined.
The concentration of serum ionic calcium changed a little in the course of a day, but no significant difference was recognized between the maximum and the minimum values in the measurement. The total amount of calcium in the serum had a tendency to decrease in the afternoon and increase at night. The concentration of ionic calcium and total calcium in the urine had a tendency to increase in the afternoon and decrease in the morning. The Erythrocyte count, hemoglobin and packed-cell volume rose during the daytime and fell down at night, showing no significant difference among the average values.
The serum ionic calcium and total calcium of female dogs in the periods of pregnancy, delivery, and lactation had a tendency to decrease at the end of pregnancy, increase a little in the midst of delivery, and decrease again during the period of lactation. The erythrocyte count, hemoglobin and packed-cell volume had a tendency to decrease in these periods, showing no significant difference among the measured values.