Related Experiment Video
Updated: Jan 30, 2026

Vitrification of In Vitro Matured Oocytes Collected from Adult and Prepubertal Ovaries in Sheep
Published on: July 10, 2021
In vitro maturation of class I oocytes of bovine during different tropical seasons
S Kanwichai1, S Panasophonkul2, P L A M Vos3
1Department of Food Animal Clinic, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand.
Abstract:
The aims of this study were to determine the effects of seasonality on yields and quality of bovine abattoir-derived oocytes and their in vitro maturation (IVM) competence in Thailand, a tropical country. Ovaries were collected monthly from a slaughterhouse, from January to June 2017, separated into cool (January to February), summer (March to April), and rainy (May to June) seasons. Cumulus oocyte complexes (COCs) were obtained by follicular aspiration, and subsequently, oocyte yield and quality were examined. Selected class I and II COCs were cultured under IVM condition, and their maturation capacity was also evaluated. Results showed that average numbers of COCs and class I COCs per ovary were highest in summer. However, no significant seasonal difference in oocyte maturation rates was found. The higher numbers of COCs and class I COCs in summer might be caused by their follicular development during the cool season, and might be a reason why the pregnancy rate in summer is better than in the rainy season.
Related Concept Videos
Seasoning of Wood
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
Biological Clocks and Seasonal Responses
Maturation of Endosomes
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
Drug Classes and Categories
Antibody Structure and Classes
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
Bacterial Protein Maturation

