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- W2014522504 abstract "The aim of this study was to evaluate the effect of progesterone supplementation and stage of oestrous cycle on in vitro maturation (IVM) of canine oocytes. Oocytes were cultured in medium supplemented with 0, 2000, 4000 or 8000 ng progesterone ml(-1) (Expt 1; n=274 oocytes) or 0, 20, 200 or 2000 ng progesterone ml(-1) (Expt 2; n=789 oocytes). In Expt 3, oocytes (n=1202) were cultured in a bi-phasic system of meiotic arrest followed by IVM, both in the presence of 0, 20, 200 or 2000 ng progesterone ml(-1). Rates of meiotic resumption for Expt 1 ranged from 40.0% to 58.5%; there were no significant differences among groups. In Expt 2, rate of meiotic resumption was significantly lower in the 2000 ng progesterone ml(-1) treatment (35.5%) compared with the 200 ng progesterone ml(-1) treatment (54.0%; P<0.05). There were no significant differences in rates of maturation to metaphase II among treatments in Expt 1 (1.8-8.6%) or Expt 2 (8.4-14.7%); however, oocytes collected from ovaries of bitches in oestrus and dioestrus had higher rates of maturation to metaphase II than did oocytes from bitches at pro-oestrus or anoestrus (P<0.01). In Expt 3, no differences were observed in rates of maturation among treatment groups. Rates of maturation to metaphase II of oocytes from bitches in dioestrus were significantly higher than those from bitches in pro-oestrus (P<0.01). These results indicate that supplementation of culture medium with progesterone either during maturation or during meiotic arrest before maturation does not increase the rate of IVM of canine oocytes. However, stage of oestrous cycle is a key factor in the selection criteria for meiotically competent canine oocytes for use in in vitro experiments." @default.
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- W2014522504 date "2003-10-01" @default.
- W2014522504 modified "2023-10-06" @default.
- W2014522504 title "Effects of stage of oestrous cycle and progesterone supplementation during culture on maturation of canine oocytes in vitro" @default.
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- W2014522504 doi "https://doi.org/10.1530/rep.0.1260501" @default.
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