“…Regarding the good practice in laboratory work, it is essential to have sufficient information to enable a correct interpretation of all the results of this species, for handling and clinical supervision and specific protocols within many researches . Because of this, several studies have described the hematological and blood chemistry values in rhesus monkeys, considering the various factors involved in the feasibility of the results, such as age, sex, type of confinement, nutrition, health status, evaluations of a variety of drugs used in chemical restraint and, finally, the seasonal and geographical variations . Nevertheless, very little information is available about hematological and biochemical changes in pregnant rhesus monkeys; because of this problem, the main objective of this work is to present the hematological and biochemical changes in a population of 28 rhesus monkeys in their first trimester of pregnancy, living in captivity.…”