Diseases of commercial chickens Flashcards

1
Q

What are immunosuppressive diseases of growers + pullet chickens?

A
  • Infectious bursal disease virus
  • Chicken anaemia virus
  • Marek’s disease
  • Reoviruses
  • Mycotoxicosis - non-infectious
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2
Q

What are respiratory diseases of growers + pullet chickens?

A
  • Mycoplasmas
  • IBV
  • aMPV / SHS
  • ILT
  • NDV
  • AIV
  • E coli
  • P multocida
  • Ornithobacterium
  • Infectious Coryza
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3
Q

What are CS of ornithobacterium rhinotracheale? Dx? Tx?

A
  • Coughing/ sneezing
  • Reducing weight gain, poor FCR
  • Reduced egg production
  • Main lesions = airsacculitis, tracheitis, bronchopneumonia
  • Dx = culture + PCR
  • Tx = antibiotics, vaccine
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4
Q

What are gastroenteteric problems of grower + pullet chickens?

A
  • Salmonella
  • E coli (ETEC)
  • Clostridium
  • Campylobacter
  • Parasites / worms / protozoa
  • Crop mycosis
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5
Q

What are clinical signs of clostridium enteritis? Dx? Tx?

A
  • Acute form in young chickens
  • Depression, ruffled feathers, sudden death, increased mortality
  • Poor weight gain + FCR
  • Necrosis of intestinal mucosa, fibrinonecrotic enteritis forming diphtheritic membrane
  • Dx = signs, lesions, culture + PCR
  • Tx = antibiotics
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6
Q

What are nervous system problems in grower + pullet chickens?

A
  • Avian encephalomyelitis
  • Marek’s disease
  • Botulism
  • Nutritional encephalomalacia
  • NDV
  • AIV
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7
Q

What is Avian encephalomyelitis? Dx? Tx? Px?

A
  • Picornavirus
  • Tremor of head + neck, legs, paralysis, cataract
  • Drop in egg production
  • Dx = histopath, PCR
  • Tx = NONE
  • Px = vaccine
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8
Q

What are non-infectious causes of lameness in grower / pullet chickens?

A
  • Tibial dyschondroplasia
  • Spondylolisthesis
  • Rickets
  • Valgus-varus deformities
  • Ionophore toxicity
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9
Q

What are infectious causes of lameness in grower / pullet chickens?

A
  • Marek’s disease
  • Botulism
  • Bumblefoot
  • Viral arthritis
  • Infectious synovitis
  • Staphylococcus / other septic arthritis
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10
Q

What is dyschondroplasia influenced by?

A
  • Affects proximal tibiotarsus- tibial dyschondroplasia
  • Influenced by
  • genetic selection
  • feed: calcium/phosphorus ratios
  • acid:base balance in feed
  • mycotoxins
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11
Q

What causes rickets?

A
  • Calcium, phosphorus or vitamin D deficiency
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12
Q

What are respiratory problems that affect layer hens? (drop in egg production)

A
  • Mycoplasmas
  • IBV
  • aMPV / SHS
  • NDV
  • AIV
  • P multocida
  • Infectious Coryza
  • Brachyspira spp infection
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13
Q

What causes peritonitis in layers? What are influencing factors?

A
  • Mainly E. coli
  • influencing factors =
  • flock uniformity
  • body weight
  • physical + hormonal stresses
  • source of bacteria = water/ air
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14
Q

Peritonitis can be secondary to what infections?

A
  • M synoviae
  • P multocida
  • Erysipelas
  • ORT
  • IBV
  • aMPV
  • NDV
  • AIV
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15
Q

How can peritonitis be treated / prevented?

A
  • Tx = antimicrobial therapy + E coli vaccination
  • Px = E coli vaccination, minimise bacterial challenges, reduce stress + sustain body weight + uniformity
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16
Q

What spirovhaetes cause severe disease?

A
  • Brachyspira intermedia
  • B. pilosicoli + B. alvinipulli = mild disease
  • B. innocens = little / no disease
  • Tx = macrolides
17
Q

What are causes of metabolic / mechanical problems in layers? ( Drop in egg production)

A
  • Cage layer fatigue
  • Uterovaginal prolapse
  • Fatty liver haemorrhagic syndrome
  • Fatty liver syndrome - too much energy in food
  • Mycotoxicosis
  • Water deprivation
  • Light failures
  • Sudden noise
  • Sudden change in feed quality
18
Q

What are sporadic cases causing problems in layers? ( Drop in egg production)

A
  • Avian tuberculosis
  • Botulism
  • Pullorum / typhoid
19
Q

What is egg drop syndrome?

A
  • Adenovirus
  • 5-50% drop in egg production for 3-4weeks then back to normal
  • No mortality increase
  • Dx = serology, histopath, PCR
  • Vaccination
20
Q
A