commercial chockens

Age for chicks

<2w

Age for slaughter broilers

>9w

Age of laying

Commercial >17w

Breeder >25w

Grower/ finisher + pullet (2-9w) - immunosuppressive diseases

Inf bursal dz virus

Chicken anaemia virus

Mareks

Reovirus

Mycotoxicosis

Grower/ finisher + pullet (2-9w) - Resp dz

Mycoplasma

Inf bronchitis virus

Avian metapneumovirus

Inf laryngotracheitis

Newcastle

AI

E. coli

Pasteurella multocida

Ornithobacterium

Inf coryza

Parasites

Ornithobacterium rhinotracheale - CS

Cough, sneeze, dec weight gain, poor FCR, dec egg

Ornithobacterium rhinotracheale - Gross

Airsacculitis, tracheitis, bronchopneumonia

Ornithobacterium rhinotracheale - Dx

Culture, PCR

Ornithobacterium rhinotracheale - Tx + prevention

AB (amoxicillin, tetracycline, macrolides)

Vaccine

Grower/ finisher + pullet (2-9w) - GI dz

Salmonella, E. coli, Clost, campylobacter, parasites, crop mycosis

Clostridium enteritis - CS

Dep, ruffled, sudden death

Weight gain, poor FCR

Clostridium enteritis - cause

Clostridium perfringens

Clostridium enteritis - Gross

Intestine mucosa necrosis, fibrino necrotic enteritis → diphtheritic membrane

Clostridium enteritis - Dx

PM, CS, culture, PCR

Clostridium enteritis - Tx

AB

Grower/ finisher + pullet (2-9w) - neuro dz

Avian encephalomyelitis

Mareks

Botulism

Nutritional encephalomalacia

Newcastle

AI

Avian encephalomyelitis - CS

Head, neck, leg tremor

Paralysis

Cataract

Dec egg

Avian encephalomyelitis - Dx

Histo, PCR

Avian encephalomyelitis - Dx

Histo, PCR

Grower/ finisher + pullet (2-9w) - lameness dz

Tibial dyschondrodysplasia

Spondylolisthesis

Rickets

Valgus varus

Ionophore toxicity

Mareks

Botulism

Bumblefoot

Viral arthritis

Inf synovitis

Septic arthritis

Dyschondrodysplasia - location

Prox tibiotarsus

Dyschondrodysplasia - Causes

Genetics

Wrong Ca:P

Acid : base imbalance

Mycotoxins

Rickets - cause

Ca, P, vit D deficiency

Rickets - CS/ gross

Rubbery bones

Can’t support

Inc skeletal deformities

Layer/ breeder (>17w) - resp dz (all lead to dec egg)

Mycoplasma

Inf bronchitis virus

Avian metapneumovirus

Inf laryngotracheitis

Newcastle

AI

Pasteurella multocida

Inf coryza

Brachyspira

Parasites

Peritonitis - main bact

E. coli

Mycoplasma synoviae

Pasteurella multocida

Erysipelas

Ornithobacterium rhinotracheale

Peritonitis - tx

AB, E. coli vaccine

Brachyspira species affecting layers + dz severity

Innocens = low

Pilosicoli = mild

Alvinipulli = mild

Intermedia = sev

Brachyspira Dx

Culture, PCR, CS (faeces)

Brachyspira tx

Organic acids

Macrolides

Layer/ breeder (>17w) - metabolic/ mechanical dz (all lead to dec egg)

Cage layer fatigue

Uterovaginal prolapse

Fatty liver H syndrome

Fatty liver syndrome

Mycotoxicosis

Dec water

Light failures

Noise

Feed quality

Environment

Avian TB

Botulism

Pullorum/ tyhoid

Egg drop syndrome - CS

Poor shell quality + colour

Egg drop syndrome - Gross

Ovary/ oviduct atrophy

Egg drop syndrome - Dx

Serology, histo, PCR

Egg drop syndrome - Tx

Vaccine

Which chicken diseases have a vaccine

Newcastle

Inf bronchitis

Avian metapneumovirus

Inf laryngotracheitis

Mycoplasma

Mareks

Inf bursal disease

Egg drop syndrome

Avian encephalomyelitis

Chicken anaemia virus

Inactivated vaccine ROA

Pectoral m

Which vaccines can be given live via egg

Mareks, inf bursal