Poultry Science Terminology - O

Ocular: pertaining to the eye 

Offal: literally means waste, and usually means, the non-edible parts of gut not sold as giblets plus the head and feet

Oil sac: large oil gland on the back of bird at the base of the tail and used by the bird to preen or condition feathers (also called the uropygial or preen gland) 

Oocyst: infective fertilized egg of certain one-celled animal parasites including protozoa

Opportunistic: organism that is non-infectious to healthy birds; infectious only to birds with reduced resistance from some other cause (stress)

Ornamental breed: breed of chicken used for ornamental purposes and are primarily appreciated for their stunning appearance as opposed to egg or meat production

Organic: federally regulated term related to production of food products according to pre-set standards. Term refers to products from animals raised without the use of hormones, antibiotics, irradiation, or genetic engineering. Vaccines and medicines are allowed for treating illness, but the meat cannot be sold as organic if certain prohibited medicines are used. Feed must be 100% organic and animals cannot be confined except under certain temporary circumstances such as illness; national organic food standards must be passed into law 

Organism: living thing

Ornithology: study and science of birds other than poultry

Osteomyelitis: inflammation of the bone marrow 

Osteopetrosis: increased size, density and brittleness of the bones

Osteoporosis: thinning and weakening of the bones 

Ova: female germ cells that become eggs 

Ovarian follicle: growth on the surface of the ovary that contains developing ovum or yolk. (germinal disc in birds)

Ovary: organ of the female avian reproductive tract which holds the female genetic material (true eggs) and produces the yolks on which the true eggs are located 

Oviduct: tubular organ of the female avian reproductive tract where the egg white (albumen), shell membranes, shell, and bloom (cuticle) are added to form a complete egg 

Oviposition: laying of an egg 

Ovulation: release of a yolk from the ovarian follicles 

Ovum: round female germ cells attached to the ovary; it releases and drops into the oviduct and becomes the egg yolk; plural - ova

Oyster shell: shells harvested from oysters that are ground into a fine powder and fed to poultry for increased calcium intake. Oyster shells are generally served as a side dressing to the normal poultry feed



Back to Poultry Science