Developmental process by which primary oocytes in the ovary develop into mature female gametes (ova) capable of fertilization.
Oogenesis
Definition
Related terms
Oedema, edema, swelling
A defect of newly hatched chicks occurring on the neck, head and joints and caus...
Oil meal
Residue from oilseeds after extraction of oil by organic solvents.
Onset of laying, point of lay
The period just after sexual maturity when hens begin laying small pullet eggs.
Organic matter
Dry matter of feed reduced by ash; includes crude protein, nitrogen‑free extract...
Organism dehydration
A reduction of water content in body tissues accompanied by a loss of certain el...
Organogenesis
Stage of ontogenetic development following blastogenesis in which definitive org...
