Development in vitro of embryos of domestic cats, in medium modified TCM 199, fresh and previously frozen / Desenvolvimento in vitro de embriões de gatas domésticas, em meio TCM 199 modificado, frescos e previamente congelados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In this study a total of 48 embryos were used in the compacts morulae, initial blastocysts and blastocysts stages in the degrees I and II, obtained from 14 adult domestic cats. Two animals presented natural manifestation of the oestrus and 12 animals were artificially induced to ovarian activity and ovulation. They received one only application of 150 IU of gonadotropins equine corionic (eCG) and 84h after, one application of 100 IU of gonadotropins human corionic (hCG), and all the animals were coupled naturally. Six days after the first mating, all cats were submitted to laparotomy, and through an adapted transcornual technique the embryos were collected and classified in agreement with IETS (1998). 27 of these were cultivated in a TCM 199 modified with a controlled CO2 atmosphere for 24 hours. The embryos were classified by development stage, quality and blastomeres number, observing a development index until expanded blastocysts in degree I of 77.7% with an average of 16115,8 blastomeres was reached. In 21 embryos the freezing technique was tested in a commercial medium with 10% of glycerol associated with 0,1molL-1 of sucrose. After the unfreezing, in 37oC water with the same cultivation conditions, a developmental index of 38.1%, was observed until the stage of expanded blastocysts in degree I, with average number of 139.111,8 blastomeres. Although the freezing and unfreezing protocols, had reduced the developmental index of feline embryos by 51% and reduce the blastomeres number (P<0.01), it was considerate a viable technique in domestic and wild felines.

ASSUNTO(S)

reproducao animal frozen embryos assisted reproduction reprodução assistida domestic cats congelamento de embriões gatos domésticos

ACESSO AO ARTIGO

Documentos Relacionados