Selection of Immature Cat Oocytes with Brilliant Cresyl Blue Stain Improves In Vitro Embryo Production during Non-Breeding Season

In domestic cats, the maturation, fertilization, and development potential in vitro decreases during the non-breeding season. This study aims at evaluating the efficacy of Brilliant Cresyl Blue (BCB) staining in selecting developmentally competent oocytes to be used in in vitro embryo production (IV...

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Bibliographic Details
Published in:Animals (Basel) 2020-09, Vol.10 (9), p.1496
Main Authors: Piras, Anna Rita, Ariu, Federica, Zedda, Maria-Teresa, Paramio, Maria-Teresa, Bogliolo, Luisa
Format: Article
Language:English
Subjects:
Anestrus
BCB
blastocyst
Blue stain
Breeding seasons
Cats
Cell number
Cytoplasm
Domestic animals
domestic cat
Embryos
Felinae
Follicles
Gametocytes
Hatching
In vitro fertilization
in vitro maturation
Lasers
Maturation
Mitochondria
Morphology
Oocytes
Ovaries
Physiological aspects
Polyvinyl alcohol
ROS
Seasons
Sexual behavior
Staining
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Summary:In domestic cats, the maturation, fertilization, and development potential in vitro decreases during the non-breeding season. This study aims at evaluating the efficacy of Brilliant Cresyl Blue (BCB) staining in selecting developmentally competent oocytes to be used in in vitro embryo production (IVEP) programs in order to overcome the season variability in blastocyst yield. Cumulus-oocytes complexes (COCs) collected from antral follicles of domestic cat ovaries during the anestrus phase (July to November) were selected by BCB staining and classified as BCB+ (colored cytoplasm) and BCB− (colorless cytoplasm). COCs not exposed to BCB staining were used as control. Before and after in vitro maturation mitochondrial activity and reactive oxygen species (ROS) were measured. Following in vitro fertilization, blastocyst rate, hatching rate, and blastocyst cell numbers were recorded. The results show that BCB staining did not alter the mitochondrial function and ROS production in cat oocytes. BCB+ oocytes presented a higher (p < 0.05) blastocyst rate, hatching rate, and blastocyst cell number than BCB− and control oocytes. In conclusion, BCB staining does not affect the bioenergetic/oxidative status of the oocyte while being a useful tool for selecting good quality oocytes to increase IVEP in domestic cats during non-breeding season.
ISSN:2076-2615
2076-2615
DOI:10.3390/ani10091496