RESUMO -Foram realizadas análises colpocitológicas das diferentes fases do ciclo estral em 20 fêmeas adultas de cutias (Dasyprocta prymnolopha), assim como a determinação da duração da gestação em outros seis animais. As cutias foram mantidas em regime de cativeiro, nas condições climatológicas encontradas no trópico úmido da Amazônia. Os animais apresentaram reprodução do tipo poliestral continua, portanto não foi observada estação reprodutiva. A duração média dos ciclos estrais de 30,69 ± 4,65 dias e período médio de gestação de 104,33 + 0,57 dias. Com relação ao estudo da citologia esfoliativa, notou-se que no proestro houve frequência maior de células superficiais anucleadas, intermediárias e parabasals; no estro observou-se em número elevado, as células superficiais (anucleadas e nucleadas) e ausência de leucócitos; na fase de metaestro houve aumento de células intermediárias e leucócitos; no diestro, as células parabasals foram observadas em número maior de vezes.Palavras-chave: Cutia, reprodução, cativeiro, colpocitologia Determination of Agouti (Dasyprocta prymnolopha) Reproductive Cycle by Colpocytologyc DiagnosticABSTRACT-Colpocytologycs analyses in distinct phases of oestral cycle were performed in 20 female agoutis (Dasypwcta prymnolopha), as well as, the determination of gestation's ienght in six others animals. The agoutis were raised in captive management, in climatologie conditions of Amazon humid tropic. The animals showed a polyestrus continous reproduction pattern, then no sazonality was observed. The oestral period was 30,69 ± 4,65 days and the gestation's length average was 104,33 + 0,57 days. During proestrus phase the exfoliative cytology arrangement showed high frequency of anucleated superficial, intermediate and parabasal cells, respectively; the oestrus phase had elevated rates of superficial cells (anucleated and nucleated) and absence of leukocytes; highest indices of intermediate cells and an increse of leukocytes was found in metestrus phase; in diestrus phase the predominant cells type was the parabasal.
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