O
Glossary
Oestrus
Period
of sexual receptivity.
OIE
International
Office of Epizooties.
Oocytes
Immature
ova.
Ordinal
scale
A
number which defines a thing (trait) in a standard scale.
Organogenesis
The
production of organ systems during animal embryogenesis.
Ovulation
Release
of the female germ cell (egg or ovum) by the ovary. Cows usually ovulate several
hours (up to 15 hours) after the end of estrus or standing heat.
Ovum Pick Up technique (OPU) Collection of eggs from donors through an ultrasonically guided needle inserted into the ovary.