Abstract
Changes in hematological values were studied with 131 healthy cynomolgus monkeys aged less than 11 months. The parameters measured were erythrocyte count (RBC), hematocrit value (Ht), mean corpuscular volume (MCV), hemoglobin concentration (Hb), total leucocyte count (WBC), and differential leucocyte count. No remarkable change was found with RBC during the whole period of this study. Relatively high values were obtained with Ht, MCV, and Hb in the newborns aged 0 to 7 days. These values continued to decrease until 3 months of age, after which the values increased again attaining approximately adult levels at 11 months of age. WBC was very high at birth and then decreased to the minimum level at 3 days of age. It was followed by gradual increase until about 4 months of age at which a nearly adult level was attained. Lymphocyte counts were smaller than neutrophil counts on the day of birth. However, this numerical relation was inverted 2 days after birth and the lymphocyte counts became markedly larger than the neutrophil counts about 1 week after birth. Additionally, the values obtained from the cord blood of 6 Cesarean-delivered newborns were compared with those from the blood taken 5 hours after cesarean delivery.
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