Abstract
Normal hematological values including erythrocyte count (RBC), hematocrit value (Ht), hemoglobin concentration (Hb), total leucocyte count (WBC), and differential leucocyte count were determined with 206 healthy cynomolgus monkeys (Macaca fascicularis) aged in 1 to 18 years. These animals were born and reared at Tsukuba Primate Center for Medical Science, NIH, Japan. Additionally, 32 cynomolgus monkeys of wild origin estimated to be 5 or more years old were examined for their hematology. The presence or absence of sex- and age-related differences in the values was statistically analysed. As regards infant and juvenile monkeys, there were no significant differences in RBC, Ht and Hb between males and females. However, these values became significantly larger in males than in females after sexual maturation. Lymphocyte count was larger than neutrophil count until 3 to 4 years of age after birth, but this relation was inverted in adult monkeys aged more than 5 years. Segmentation of the nucleus was a prominent finding in neutrophils. Neither sex- nor age-related difference in the number of nuclear segmentation was noted.
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