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• W2015959832 abstract "In several studies, early cleavage stage canine embryos have been derived from in vitro fertilized oocytes cultured under various conditions. Despite these results, IVF protocols for canine oocytes have yielded low fertilization rates. In this study, Experiment I compared the effects of tissue culture medium (TCM)-199 supplemented with either (A) 1 microg/ml estradiol or (B) 20 microg/ml estradiol + 1 microg/ml human somatotropin (hST) on the in vitro nuclear maturation rate of canine oocytes. Meiotic progression to the metaphase I and II (MI/MII) stages at 72 hr of in vitro culture (IVC) was 10.2% (11/108) in medium A versus 14.1% (30/142) in medium B (P = 0.802). In Experiment II, cleavage rate was determined among oocytes recovered from ovaries of bitches at different reproductive stages. Oocytes (n = 888) were retrieved from bitches at the follicular, anestrous, and luteal stages and selected for high morphological quality. Oocytes were matured for 48 hr in TCM-199 supplemented with 1 microg/ml hST + 20 microg/ml estradiol. Oocytes were in vitro fertilized with fresh canine spermatozoa that had been isolated on a Percoll gradient, and were cultured in synthetic oviduct fluid (SOF) medium with bovine serum albumin (BSA; 4 mg/ml) up to 5 days in 5% CO(2) in air at 37 degrees C. A proportion of oocytes (30.6%) with identifiable nuclear material had cytoplasm penetrated or fertilized by sperm. The percentage of oocytes developing into early stage embryos was 10.1% (27/267). Although pronuclear development was observed to be higher for oocytes recovered at the follicular phase, the cleavage rate was similar among oocytes recovered from bitches at the follicular, anestrus, and luteal stages. There was no correlation between the proportion of capacitated or acrosome reacted spermatozoa and pronuclei formation and/or percent cleavage. It was concluded that TCM-199 supplemented with 1 microg/ml hST and estradiol (20 microg/ml) supports nuclear and cytoplasmic maturation of canine oocytes. In this study, meiotic competence was verified by the in vitro production (IVP) and development of embryos up to the 8 cell-stage. Furthermore, the results indicate that, under the described conditions and despite the influence of reproductive status of the bitch on the developmental competence of in vitro fertilized oocytes to the pronuclei stage, cleavage was independent of donor's reproductive estrous cycle stage." @default.
• W2015959832 created "2016-06-24" @default.
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• W2015959832 date "2003-01-01" @default.
• W2015959832 modified "2023-10-18" @default.
• W2015959832 title "Embryonic development of in vitro matured and in vitro fertilized dog oocytes" @default.
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• W2015959832 doi "https://doi.org/10.1002/mrd.10394" @default.
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