Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.theriogenology.2018.12.010

Title: Supplementation of bovine follicular fluid during in vitro maturation increases oocyte cumulus expansion, blastocyst developmental kinetics and blastocyst cell number.
Issue Date: 14-Jan-2019
Date of creation: Dec-2018
ISSN: 0093-691X
Related subjects: CDU::6 - Ciencias aplicadas::61 - Medicina::612 - Fisiología
Keywords: Bovine follicular fluid
Maturation
Heat-inactivation
Embryo
Vitrification
Abstract: Bovine follicular fluid (bFF) is the natural milieu for oocyte growth and development. However, its value as supplementation to in vitro maturation medium is still questioned due to inconsistent results. In this study we hypothesized that adding 10% of follicular fluid as well as heat treating it to inhibit the complement system, would produce higher quality embryos. To do so, experiments were conducted to compare the effect of bFF and heat-treated bFF (bFFin) on oocyte competence assessed by different parameters such as nuclear and cytoplasmic maturation, IVF efficiency, in vitro embryo development and embryo survivability post-vitrification. No differences on nuclear maturation nor cortical granules migration were observed but differences were found on oocyte’s cumulus cell expansion, with bFF group having the highest increase (79.0±3.7%). bFFin had a negative impact on IVF efficiency (58.6±3.2%), but no differences were found between bFF (62.9±3.2%) and control (72.8±3.0%). Although the cleavage and blastocyst rate were similar between groups, the day 6 embryo development rate was higher in bFFin group, suggesting an accelerated developmental kinetics. Hatched blastocysts from the bFF group showed a higher cell count than the control group (241.3±20.1 and 185.8± 10.0, respectively), and bFFin embryos showed values in between (214.9±14.0). No difference on survivability post-vitrification was found between groups, although the blastocyst stage had a significant impact on the survival rate across all groups. In conclusion, using bFF as supplementation to maturation medium showed a higher benefit when comparing to the standard supplementation by having oocytes with higher cumulus expansion rate, faster development of embryos and higher number of cells per embryo. Inactivation of bFF lowered IVF efficiency but didn’t compromise blastocyst development and quality.
Primary author: Lopes, Jordana S
Canha-Gouveia, Analuce
París-Oller, Evelynne
Coy, Pilar
Director: Coy Fuster, Pilar
Faculty / Departments / Services: Facultades, Departamentos, Servicios y Escuelas::Departamentos de la UMU::Fisiología
Collection: 126
Editor's version: https://www.sciencedirect.com/science/article/pii/S0093691X1830760X
URI: http://hdl.handle.net/10201/66299
DOI: https://doi.org/10.1016/j.theriogenology.2018.12.010
Document type: info:eu-repo/semantics/preprint
Number of pages / Extensions: 32
Rights: info:eu-repo/semantics/openAccess
Sponsor: Horizon 2020 Marie Sklodowska-Curie Innovative Training Network (REPBIOTECH675526); Ministry of Economy and Competitiveness (Spain) (AGL2015-66341-R MINECO-FEDER) and Fundación Séneca (20040/GERM/16)
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