Document Detail

Morphology of immature bovine oocytes.
MedLine Citation:
PMID:  2793058     Owner:  NLM     Status:  MEDLINE    
Bovine cumulus oocyte complexes (COCs) as used for in vitro maturation and fertilization can be classified into different categories by light microscopical inspection. We have distinguished four categories based on compactness and transparency of the cumulus investment and homogeneity and transparency of the ooplasm. The four categories were studied for their morphological characteristics at the ultrastructural level and for their developing capacity in an in vitro maturation system. In categories 1 and 2 oocytes, organelles were evenly distributed. In categories 3 and 4, oocytes organelles were clustered and the distribution of the organelles mimicked the characteristics of oocytes during final maturation. Cumulus cell process endings penetrated the cortex of the oocyte or were located superficial to the cortex of the oocyte. In category 1 oocytes, most of the process endings penetrated the cortex. In category 4 oocytes, most of the process endings did not penetrate. In categories 2 and 3 oocytes, both forms of process endings did occur. After in vitro maturation, only category 4 oocytes showed a decreased developing capacity. Categories 1-3 oocytes showed equal developing capacity in an in vitro maturation system.
F de Loos; C van Vliet; P van Maurik; T A Kruip
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Gamete research     Volume:  24     ISSN:  0148-7280     ISO Abbreviation:  Gamete Res     Publication Date:  1989 Oct 
Date Detail:
Created Date:  1989-11-21     Completed Date:  1989-11-21     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7806559     Medline TA:  Gamete Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  197-204     Citation Subset:  IM    
Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, University of Utrecht, The Netherlands.
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MeSH Terms
Cattle / physiology*
Cytoplasm / ultrastructure
Fertilization in Vitro
Oocytes / physiology,  ultrastructure*

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