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O i chemical symbol oxygen
ii somatic antigen
 
O antigen bacterial cell wall antigen (ohne Hauch)
 
OA i olecranol apophysis
ii Order of Australia
iii osteoarthritis
 
OACOM vincristine, L-asparaginase, cyclophosphamide, methotrexate (protocol)
 
OAF osteoclast activating factor
 
OATA Ornamental Aquatic Trade Association Ltd
 
OAVT Ontario Association of Veterinary Technicians
 
OB obstetrics
 
OBDT “open but don’t touch”
 
OBRA Oregan Biomedical Research Association
 
OC i occipital cortex
ii organochlorine compounds
 
OCD osteochondritis dissecans
 
OCDH osteochondritis dissecans of medial condyle of the humerus
 
OCM ovum culture medium
 
OCR optical character recognition
 
O-cresol 2-methylphenol (from coal or wood tar)
 
OCT ornithine carbamoyl transferase (liver enzyme)
 
OCTT orocaecal transit time
 
OCVE Spanish Veterinary Association
Organizacion Colegial Veterinaria Espanola
 
OD i optical density
ii outer diameter
iii overdose
iv right eye (L.oculis dexter)
 
od once daily (L.omnidie)
 
ODA Overseas Development Agency
 
ODE old-dog encephalitis
 
OECD Organisation for Economic Cooperation & Development
 
OES Old English Sheepdog
 
OEVI National Food Investigation Institute (Hungary)
Országos Élelmiszervizsgáló Intézet
 
O-F test oxidation-fermentation test (bacteria/glucose)
 
OFA i Orthopaedic Foundation for Animals (USA)
ii Orthopaedic Foundation of America
 
OFFA Orkney Fish Farmers Association
 
OFN Oxygen Free Nitrogen
 
OFT Office of Fair Trading
 
OGM Ordinary General Meeting
 
OGT Austrian Scientific Society of Veterinarians
Österreichische Gesellschaft der Tierärzte
 
OGYE oxytetracycline, glucose, yeast extract (agar)
 
OHCS hydroxycorticosteroids
 
25-OHD 25-hydroxyvitamin D
 
OHE ovariohysterectomy (medical records)
 
17-OHP 17-hydroxyprogesterone
 
OID ovine interdigital dermatitis
 
OIE International Office of Epizootics
Office International des Epizooties
 
OIK ovine infectious keratoconjunctivitis (also OIKE)
 
OJ(EC) Official Journal (of the EC)
 
OJVR Onderstepoort Journal of Veterinary Research
 
OL left eye (L.oculus laevus)
 
O level Ordinary level (examination-replaced by GCSE)
 
OM organic matter
 
OMAGOD ovine mouth and gum obscure disease
 
OMP ovotidine 5 monophosphate
 
OMV Portuguese College of Veterinary Surgeons
Ordem dos Médicos Veterinários
 
ONC Office National de la Chasse (France)
 
ONH optic nerve hypoplasia
 
ONPG test o-nitrophenyl-b-D-galactopyranoside test
 
OOH out of hours
 
OP i organophosphate
ii organophosphorous (compounds)
 
O/P oropharyngeal
 
o,p´- DDD 1,1-dichloro-2-(o-chlorophenyl)-2-(p-chlorophenyl)ethane
 
OPIN Organophosphorus Information Network
 
OR i observed ratio
ii odds ratio
iii operating room
iiii osmotic resistance
 
ORF open reading frame
 
ORL odontoclastic resorptive lesions
 
ORPRC Oregan Regional Primate Research Centre
 
ORT i oral replacement therapy
ii Ornithobacter rhinotrocheale
 
OS i left eye (L.oculis sinister)
ii Orthopterists’ Society
 
os i bone
ii body orifice
iii mouth
 
OS strain obese strain of White Leghorn chickens
 
OSCC ocular squamous cell carcinoma
 
OSCE objective structured clinical exams
 
OSERA Ohio Scientific Education & Research Association
 
OSPT one stage prothrombin time
 
OSVE objective structured video exams
 
OT i old tuberculin
ii operating theatre
 
OTC i over the counter (products)
ii oxytetracycline
 
OTMS Over Thirty Month Slaughter Scheme (ref BSE)
 
OU each eye (L.oculi uterque)
 
OVMA i Ohio Veterinary Medical Association
ii Oklahoma Veterinary Medical Association
iii Ontario Veterinary Medical Association
 
OVS Official Veterinary Surgeon
 
Oz ounce weight avoirdupois

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