The equine oocyte: factors affecting meiotic and developmental competence

Molecular Reproduction and Development
K Hinrichs

Abstract

There is currently much interest in assisted reproduction techniques in the horse, however, many aspects of oocyte maturation, fertilization, and embryo development in the horse differ from those in other species. Because of the close attachment of the equine oocyte to the follicle wall, scraping of the follicle is the most effective method for oocyte recovery. A notable feature of equine oocytes is that those with expanded cumuli (Ex oocytes), which originate from atretic follicles, have higher meiotic competence (ability to mature to metaphase II in vitro) than do oocytes with compact cumuli (Cp oocytes). Cp oocytes originate in viable follicles but are largely juvenile. Recovery and culture of equine oocytes immediately after slaughter yields a higher maturation rate than that obtained from oocytes after ovary storage; this is related to damage to chromatin in Cp oocytes during storage. In contrast, developmental competence (rate of blastocyst development in vitro) is higher in oocytes recovered from the ovary after a delay. The optimum duration of maturation varies based on cumulus morphology and time of recovery from the ovary, but there is no difference in developmental competence between Ex and Cp oocytes. Because standa...Continue Reading

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Citations

Mar 12, 2011·Journal of Assisted Reproduction and Genetics·Marc-André Sirard
Dec 14, 2011·Molecular Human Reproduction·Federica FranciosiAlberto M Luciano
May 6, 2015·Molecular Reproduction and Development·R LabrecqueM A Sirard
Apr 9, 2015·Reproduction : the Official Journal of the Society for the Study of Fertility·Young-Ho ChoiKatrin Hinrichs
Mar 12, 2017·Reproduction : the Official Journal of the Society for the Study of Fertility·A BerteroT Nervo
Apr 15, 2018·Equine Veterinary Journal·L H A Morris
Apr 30, 2013·Reproduction, Fertility, and Development·Abdollah Mohammadi-SangcheshmehMichael Hoelker
Mar 22, 2020·Journal of Cellular Physiology·Lide TotorikaguenaEkaitz Agirregoitia
Jun 25, 2020·Cells·Irina Bogolyubova, Dmitry Bogolyubov
Feb 20, 2015·Reproduction, Fertility, and Development·Kun Zhang, George W Smith
Dec 1, 2011·Reproduction, Fertility, and Development·Ghylène Goudet
Apr 18, 2013·Animal Science Journal = Nihon Chikusan Gakkaihō·Kana SatoNaomi Kashiwazaki
Oct 21, 2015·Reproduction in Domestic Animals = Zuchthygiene·L González-FernándezB Macías-García
Mar 17, 2020·Reproduction, Fertility, and Development·Tine De CosterKatrien Smits
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Achraf BenammarPascale Chavatte-Palmer

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