Establishment of conditions for ovum pick up and IVM of jennies oocytes toward the setting up of efficient IVF and in vitro embryos culture procedures in donkey (Equus asinus).
[en] Most wild and domestic donkey breeds are currently endangered or threatened. Their preservation includes the creation of a Genome Resource Bank. Embryos cryopreservation allows the preservation of genetics from both male and female and is the fastest method to restore a breed. Because embryo production in vivo is limited in equids, our objective was to establish conditions for in vitro production of embryos in donkey using ovum pick up (OPU), IVM, IVF, and in vitro culture of zygotes. Donkey cumulus-oocyte complexes (COCs) were collected by transvaginal ultrasound-guided aspirations OPU in adult cyclic jennies and in vitro matured in tissue culture medium 199 supplemented with fetal calf serum and epidermal growth factor for 24, 30, 34, or 38 hours. They were preincubated with oviductal fluid for 30 minutes, coincubated with frozen-thawed donkey semen treated with procaine for 18 hours, and cultured for 30 hours in Dulbecco's Modified Eagle Medium-F12 supplemented with NaHCO3, fetal calf serum, and gentamycin. From the five OPU sessions, we collected 92 COCs in 193 follicles (48%) with an average of 4.2 COCs per jenny. All COCs were expanded after more than 24-hour IVM. At collection, jennies oocytes contained a germinal vesicle. Metaphase 1 oocytes were observed after 30-hour IVM and 44% were in metaphase 2 after 34-hour IVM. In our conditions, IVM of donkey oocytes was slower than IVM of equine oocytes and optimal duration for donkey oocytes IVM may be 34 hours. Only 15% of jennies oocytes contained two pronuclei after coincubation with donkey spermatozoa and none of them developed further after 48 hours post-IVF. Moreover, some parthenogenetic activation occurred. Thus, the treatment of donkey sperm with procaine may not be efficient for IVF. In conclusion, we established for the first time conditions for OPU in jennies with high recovery rates. We reported that IVM of jennies oocytes can produce 44% of metaphase 2 oocytes after 34 hours in culture and we described for the first time the chronology of IVM of donkey oocytes. Further studies are in progress to establish efficient conditions for IVF and development of donkey zygotes.
Establishment of conditions for ovum pick up and IVM of jennies oocytes toward the setting up of efficient IVF and in vitro embryos culture procedures in donkey (Equus asinus).
Publication date :
15 July 2016
Journal title :
Theriogenology
ISSN :
0093-691X
eISSN :
1879-3231
Publisher :
Elsevier, Netherlands
Volume :
86
Issue :
2
Pages :
528-35
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2016 Elsevier Inc. All rights reserved.
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