Document Detail

Contribution of the oocyte to embryo quality.
MedLine Citation:
PMID:  16256189     Owner:  NLM     Status:  MEDLINE    
The ability of a bovine embryo to develop to the blastocyst stage, to implant and to generate a healthy offspring is not a simple process. To clarify the importance of the contribution of the oocyte to the embryo quality, it is important to define more precisely the different types of competence expressed by oocytes. The ability to resume meiosis, to cleave upon fertilization to develop into a blastocyst, to induce pregnancy and to generate an healthy offspring are all separate events and succeeding in the first events does not ensure the success of subsequent ones. Furthermore, these events are associated with the three types of maturation processes observed in the oocyte: meiotic, cytoplasmic and molecular. These abilities vary also upon the type of follicle the oocytes is removed from. Larger or slow-growing follicles have been shown to foster better eggs than small or actively growing follicles. Hormonal stimulation can also affect oocyte competence with the nature of the effect (positive or negative) depending on timing and dose. This complex situation requires better definition of the contribution of each factor affecting the oocyte competence and the resulting embryo quality.
Marc-André Sirard; François Richard; Patrick Blondin; Claude Robert
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Publication Detail:
Type:  Journal Article; Review     Date:  2005-10-26
Journal Detail:
Title:  Theriogenology     Volume:  65     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-11-28     Completed Date:  2006-05-17     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  126-36     Citation Subset:  IM    
Centre de Recherche en Biologie de la Reproduction, Department of Animal Sciences, Laval University, Pav. Comtois, Sainte-Foy, Que., Canada G1K 7P4.
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MeSH Terms
Cattle / embryology,  physiology*
Cell Division
Embryo Culture Techniques / methods,  veterinary*
Embryo, Mammalian / physiology*
Oocytes / physiology*
Ovarian Follicle / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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