RESUMO -A preservação de material genético e a aplicação de biotécnicas reprodutivas têm sido sugeridas como método auxiliar na preservação de espécies. No presente estudo, ovócitos de gatas domésticas foram submetidos à maturação in vitro (MIV) com intuito de estabelecer um protocolo eficaz para a o uso posterior em felinos selvagens. Um total de 808 ovócitos (390 grau I e 418 grau II) foi coletado de ovários de 43 gatas, com uma média aproximada de 9 ovócitos de cada categoria por animal. Uma amostra de 156 ovócitos foi corada com fluoróforo específico para DNA, verificando o estágio meiótico. No total, 70% dos ovócitos atingiram Metáfase II, sendo considerados maduros. A taxa média de maturação dos ovócitos grau I (74±3%) foi maior (p<0,05) do que a dos grau II (67±3). Conclui-se que os protocolos utilizados foram eficientes e a MIV de ovócitos de gata doméstica pode ser utilizada em nosso laboratório como referência para estudos com felinos selvagens. Palavras-chave: maturação in vitro, ovócitos, felinos.ABSTRACT -The establishment of genome resource banks and the application of assisted reproduction has been proposed as auxiliary tools for preserving endangered species. In this study domestic cat oocytes were matured in vitro (IVM) as a model for defining efficient protocols for wild felid species. A total of 808 oocytes (390 grade I and 418 grade II) were collected from 43 domestic cat ovaries, with a mean number of 9 oocytes, per category, per animal. To assess the meiotic cycle phase, 156 oocytes were stained with DNA specific marker. Overall, 70% of the oocytes were considered mature (Metáfase II). The mean maturation rate for oocytes grade I (74±3%) were higher (p<0.05) than that for oocytes grade II (67±3). In conclusion, the described protocols were effective and domestic cat IVM can be used in our laboratory as a control for studies in wild felids.
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