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Poultry Farmer Workshop: Husbandry / Disease / Pasture Management
January 7, 2019U. C. DAVIS
MARK C. BLANDPOULTRY PRACTIONER
CUTLER ASSOCIATES
NAPA, CA
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COMMON BACK YARD POULTRY DISEASES
• A) Neoplastic:• B) Respiratory Diseases:• C) Nervous System Diseases:• D) Enteric Diseases:• E) Systemic Diseases:• F) Skeletal:• G) Internal Parasites:• H) External Parasites:• I) Others:
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Conventional production vs cage free / outdoor access
• Respiratory
– Bronchitis, Pox, Laryngotracheitis, Influenza (AI)
• Bacterial
– Mycoplasma, Pasteurella (Cholera), Erysipelas
– E. coli (+/1-), Salmonella
• Parasitic
– Coccidiosis, Worms (round, tape), mites, lice, Histomonas
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Conventional production vs cage free / outdoor access
• To put the fear of GOD into you about the prevention of
introducing one or more poultry disease(s) into your
operation!
– Fowl Cholera, Coryza, Infectious Laryngotracheitis
• Will stay forever in a multi-aged poultry farm
– AI / vNDV (END)
– Salmonella (Food Safety)
• SE, ST, SH, ETC
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POULTRY DISEASESNEOPLASTIC
• Marek’s Disease: Herpes virus (“range paralysis”)
• Lymphoid Leukosis: Retrovirus (“big liver disease”)
• BOTH ARE CHICKEN ONLY DISEASES!!
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POULTRY DISEASESNEOPLASTIC
Comparison areas Marek’s Lymphoid Leukosis
Age of Signs <4-6 weeks >16 weeks
Paralysis YES NO
Agent DNA herpes virus RNA retrovirus
Vaccination Day of Age None
Transmission Horizontal (fluff)primary feather follicle
VerticalEgg transmission
Other Names Range Paralysis Big Liver
Cell type T Cell B cell
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POULTRY DISEASESNEOPLASTIC
• Gross Lesions: (tumors)
Comparison Areas Marek’s Lymphoid Leukosis
Nerve Yes No
Liver Yes Yes
Kidney Yes Yes
Spleen Yes Yes
Bursa Enlarged or atrophied Nodular Tumor
Grey Eye Yes (adult) No
Skin Yes No
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POULTRY DISEASESNEOPLASTIC
Comparison areas
Marek’s Lymphoid Leukosis
Clinical signs AsymmetricalParesis/Paralysis (wing, neck or leg)Pale shrunken comb
Non-SpecificEmaciated/abdominal massesPale shrunken combPenguin walk/stance
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Normal spleen vs enlargedspleen
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NORMAL EYE MAREK’S DISEASE
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POULTRY DISEASESNEOPLASTIC
• Comments:– Marek’s
• Most common of the Lymphoproliferative diseases of chickens• Controlled through day-old vaccination programs
– Lymphoid Leukosis• Infection occurs in all chicken flocks, with few exceptions. By
sexual maturity most birds have been exposed. Incidence of clinical disease is low.
• Controlled though breeder selection (test & slaughter)
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POULTRY DISEASESNEOPLASTIC
• Diagnosis
– Microanatomy (Histopathology)
– Clinical signs
– Age of the affected bird
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POULTRY DISEASESNEOPLASTIC
• Prevention• Vaccinate against Marek’s!!!
• MD-Vac CFL (Zoetis) live Turkey Herpes Virus vaccine-
$20 per bottle
• 0.2mL sub-Q in back of neck in 1 day old chicks
• Only vaccine that doesn’t require a liquid nitrogen tank
for storage
• Cannot save the vaccine once it has been rehydrated, so
you will need a new bottle for every hatch!
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POULTRY DISEASESNEOPLASTIC
• Outcome for clinical birds = humane
euthanasia
– cervical dislocation for backyard birds
– CO2 for commercial birds
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RESPIRATORY DISEASES
● Newcastle Disease: Paramyxovirus ● Infectious Bronchitis: Corona virus● Avian Influenza: Myxovirus (fowl plague)● Infectious Laryngotracheitis: Herpes Virus● Infection Sinusitis: Mycoplasma gallisepticum (MG)● Chronic Respiratory Disease: MG and E. coli● Infectious Coryza: Hemophilus paragallinarum● Turkey Coryza: Bordetella avium● Aspergillosis: (Brooder Pneumonia)
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RESPIRATORY DISEASES
● Difficult to distinguish viral respiratory infections in the field.● Newcastle, Bronchitis, Influenza● Laryngotracheitis (ILT) (gasping, tracheal plugs)
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NEWCASTLE DISEASE
• Caused by a virus (Paramyxovirus)
– There are 9 serogroups
– Paramyxovirus (PMV-1), Newcastle Disease is the
most important
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NEWCASTLE DISEASE
● Occurrence:
● Usually occurs in chickens, pigeons & less often in turkeys
● Most poultry and many wild & cage birds are susceptible
● All age groups are susceptible
● Humans may develop a localized eye infection
[conjunctivitis] from the NDV vaccine (concentrate)
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NEWCASTLE DISEASE
● Three pathogenic classifications:
● Lentogenic
● Little or no clinical signs or mortality
● Mesogenic
● Moderate pathogenic/respiratory signs, in egg production,
in mortality
● Velogenic (Exotic Newcastle, vNDV, END)
● High mortality (up to 100%) , severe drop in egg production, CNS
signs, acute respiratory distress, hemorrhagic lesions
● (in unvaccinated poultry)
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NEWCASTLE DISEASE
• Diagnosis
– Based on history, clinical signs & gross lesions
– Serology: paired serum samples 3 – 4 weeks apart
– Histology (microanatomy)
– Virus isolation (diagnostic lab)
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NEWCASTLE DISEASE
• Control / prevention
– Biosecurity
– No treatment
– Vaccination (Not practical for back yard flocks)
• Helps prevent clinical signs, reduces mortality & shedding of virus
• Eye drop administration
– if END in area
• Does not prevent infection
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Infectious Bronchitis
• Acute, highly contagious viral respiratory infection
of chickens only (Corona virus)
• Characterized by
• Respiratory signs [gasping, sneezing, coughing & nasal
discharge],
• a marked drop in egg production, misshapen, poor
internal egg quality.
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Infectious Bronchitis
• Clinical signs (can last up to 10 -1 4 days)
– Morbidity nearly 100 %
– Low mortality
– Coughing, “rales”, snicking, depressed birds
– egg production (up to 70 % )
• Eggshells can be soft, miss-shappened, wrinkled, water whites
(albumin)
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Infectious Bronchitis
• Gross lesions
• Non-specific,
– Mild Tracheitis & airsacculitis
• Diagnosis
– Same as NDV
• Prevention / treatment
– Same as NDV,
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Infectious Laryngotracheitis
• Causative agent: Herpes Virus
– Gift that keeps on giving
– Chickens only disease
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Infectious Laryngotracheitis
• Clinical Signs
– Severe dyspnea
• Bloody exudates from nares or mouth
– Not seen by presenter
• Gasping, high pitch squeal,
• Coughing & sneezing
– Conjunctivitis (meat birds/ brown pullets
– Spreads slowly through flock (cage systems)
– Mild drop in egg production
– Affects birds generally older than 5 – 6 weeks of age
– Not egg transmitted
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Infectious LaryngotracheitisLesions
Hemorrhagic TracheitisCheesy Tracheal plugsSimilar gross lesions to “wet Pox”
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LESIONS (Layers):
Hemorrhagic tracheitis
Lesions (Broilers):
Conjunctivitis, sinusitis, and mucoid tracheitis
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Infectious Laryngotracheitis
• Diagnosis
– Histopathology
• Intranuclear Inclusion Bodies
– Virus isolation
• Treatment
– None
– Can Vaccinate in the face of an outbreak
• TCO (ILT-Ivax)
– Administered via eyedrop
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Avian Pox
• Common types of Avian Pox
– Fowl, Pigeon, Turkey & Canary Pox
• Slow spreading viral infection (Pox virus)
– Mechanical vectors (mosquitos
– Trauma (picking)
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Avian Pox
• Two forms
– Dry,
• Cutaneous lesions (black scabs)
• On unfeathered parts of bird
– Wet
• Oral diphtheritic lesions,
• Associated with mortality
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Avian Pox
• Diagnosis
– Signs and Histopathology (microanatomy)
• Treatment– Isolate birds with scabs (treat individually)– Remove scab (stimulates immune response), Rx for
2° bacterial infection, scab contains live Poxvirus– Wear latex gloves, 1 set for each bird
– Topical antibiotic, pine tar, alcohol– Vaccinate (in face of outbreak) wing-web
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“Pox Take”, Commonly seen 7 – 10 days post vaccination.
The “Take” represents the bird’s reaction and immune response to the Pox vaccine.
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Pasteurella multocidaFowl Cholera
• Bacterial disease
• Very contagious and causes high mortality
• Chronically infected and asymptomatic carriers
are the primary source of infection– Rodents, coyotes, foxes, bob cats, raccoons, skunks,
cattle, rabbits,
– Domestic cats and dogs may also carry the infection
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Pasteurella multocidaFowl Cholera
• Signs & lesions:
– Chickens
• Sudden death ,abscesses, enteritis, CNS
• Swollen wattles, joints, foot pads
• Turkeys– Same as chickens, plus
– Consolidated & necrotic lung (hard lung), usually left
– Blood in mouth (acute death), airsacculitis
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Septic lesions consisting of small white foci (granulomas) in the liver and spleen.
Not specific for Cholera, common in septic bacterial infections
LIVER SPLEEN
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Pasteurella multocidaFowl Cholera
• Diagnosis:
– Culture for bacteria
– Clinical signs and gross lesions
• Treatment (Rx)
– Agribon (sulfa), Tetracycline / Oxytetracycline
– Naxcel (injectable)
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Pasteurella multocidaFowl Cholera
• Prevention:
– Biosecurity is the key
• Remove flocks with history of Cholera (carriers)
• Sound fencing
– Bury the fence, lay a strip of woven fence on the ground adjacent to the
outside part of the fence on the ground, electric
• Avoid cattle, rabbits, mammals that eat rodents
• Quick response to mauled birds
– Humanely euthanize affected bird, no first aid
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Salmonella
• Bacteria
– 2,600 serotypes
• A) Host specific (Avian)
• B) Non-host specific (Paratyphoid)• Infects many plant and animal species
• Ubiquitous organism (found every where)
• Food safety issue with eggs and poultry meat
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Salmonella
• A) Host specific (Avian)
– Non-zoonotic (does not infect people)
– Considered exotic disease in U. S.• Infected flocks will be destroyed by government
– NPIP for breeders, egg transmitted,
• S. pullorum (Bacillary White Diarrhea)• Chick mortality, asymptomatic in pullets
• S. gallinarum (Fowl Typhoid)• Primarily in pullets and adult poultry
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Salmonella
• B) Non-Host specific (Paratyphoid)
– Motile bacteria
– Egg transmitted
– Zoonotic
• S. typhimurium, S. enteritis (SE), S. heidelberg, just
to name a few
• SE is the only one the FDA cares about (currently)
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Salmonella• B) Non-Host specific (Paratyphoid)
– Motile bacteria
– Egg transmitted
– Zoonotic
• S. typhimurium, S. enteritis (SE), S. heidelberg,
• SE is the only one the FDA cares about (currently)
• Food safety issues with eggs (FDA)
• Food safety with poultry meat (FDA & USDA)
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Salmonella
• Signs
– Chicks / poults
• Increased mortality 1 – 4 wks of age
• Weak, pasting of vent, stunting
• Asymptomatic
– Adults
• Asymptomatic, diarrhea, pale comb wattles
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•Lesions: (1° young birds)
–Acute None
Subacute to chronic:
Cecal cores, enlarged spleen
Grey nodules in liver, spleen, intestines, cecum & heart
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•Lesions (adults):–1° intestinal carriers, –Salpingitis
•Lesions: Paratyphoid –Marked enteritis, –necrotic foci on liver
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Salmonella
• Diagnosis
– Submit to CAHFS lab
– Serology, culture
• Treatment
– RX: Sulfa compounds, Neomycin
– Breeders generally don’t treat
• Egg transmitted,
• Depending on the Salmonella, flock maybe put down
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Salmonella• Prevention
– Biosecurity / QA plan
• Written prevention (mitigation) protocols
– Rodent control (S. typhimurium = mouse fever)
– C & D premise and equipment
– Probiotics
– Vaccination (live + killed)
– Test & slaughter breeders
• Egg transmitted
• Depends on Salmonella type
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Coccidiosis
• Occurs anywhere poultry are grown • Seen primarily in young birds
– Require 6 - 8 days to complete life cycle– Generally between 3 & 6 weeks of age
• Characterized by diarrhea & enteritis• Associated with warm / humid conditions
• Brooder stoves and damp/wet litter
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Coccidiosis
• Single cell protozoa (Eimeria genus)
– Direct and complicated life cycle
– Ooccyst (egg) is very resistant
• Survives in environment for 18 + months
– One sporulated oocyst may produce 100,000
offspring
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Coccidiosis
• Nine species of Eimeria in chickens
• Five are pathogenic
– E. acervulina, E. necatrix, E. maxima, E. brunetti,
– E. tenella
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•Cool Video–life cycle–vaccine use and success
–https://www.youtube.com/watch?v=NFh2aPmuYQE
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Coccidiosis
– Produce lesions in intestines by destruction of epithelial cells, through their replication process
– Infection with one species of Coccidia stimulates an immune response only to that one species.
– Host still remains susceptible to other strains of Coccidia.
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Coccidiosis• Outbreaks may occur due to:
– Poor wet litter conditions– Lack of immunity in chicks without an
Anticoccidial drug in the feed.• Amprolium
– Reaction to improper use of Cocci vaccine• Chicks are vaccinated at hatchery, but chicks are
immunized on the farm through proper management of chick’s environment.
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Coccidiosis
• Clinical signs
– Vary with each species of Cocci
– Few or no clinical signs
– Diarrhea (mucoid or bloody)
– Dehydration, ruffled feathers, weakness
– May see increase in mortality
• Generally associated with Necrotic Enteritis
– Sequella of Cocci infection
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•Eimeria acervulina (moderately severe pathogen)
–Upper one third of intestines
Mild to severe enteritis
Thickening of mucosa. Transverse white to gray striations or plagues on mucosa
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•E. necatrix (severe pathogen)
Middle one third of intestines
Severe enteritis, congestion hemorrhage, necrosis and bloody feces
Oocysts develop only in ceca
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•E. tenella (severe pathogen)
–Lower one third of intestines (Cecum) –Marked typhlitis
Blood often apparent in ceca and feces, later cheesy cecal cores may be found.
Associated with high mortality
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Coccidiosis
• Diagnosed
– Clinical signs & gross lesions / Histology
• Prevention (99+% will be exposed to Cocci)
– Develop active immunity
• Good litter management (20-30 % moisture),
• Exposure to moderate numbers of Cocci Oocysts
– Use of anticoccidials in feed
• Amprolium, Oregano
– Immunization
• Vaccine
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Coccidiosis
• Treatment
– Not very satisfactory
– Amprolium - water
– Sulfa (Agribon) – water
– Liquid Vitamin A + K - water
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Round worms
• Ascardia galli: chickens
• Ascardia dissimilus: turkeys
– Most Common species
– Host specific
• Direct life cycle (28-30 days)
• Eggs remain viable for up to 3 plus months
• Eggs survive disinfectants (physically must remove eggs
from environment
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Round worms
• Lesions
– Enteritis (small intestines, emaciation
• Diagnosis
– Fecal float, Necropsy, histology
• Treatment
– Check label for withdrawal time
• If eggs / meat will be sold to public
– Piperazine (14 day withdrawal / water), only adult worms
– Safe Guard AquaSol® (Fenbendazole) water administration ($$$)
– Diatomacious earth in the feed (20 lbs per ton) - helps
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MitesExternal parasites
• Red
• Northern
• Scaly Leg
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MitesExternal parasites
• Red
– Blood suckers
• Anemia
– Feed at night
• Found on birds only at night
– Day time
• Found in cracks / joints of roosts and barn
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MitesExternal parasites
• Northern Fowl Mites
– Blood suckers
• Anemia
– Stay on host continuously near vent area
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•Scaly Leg Mites: (Knemidokoptes mutants)
–Shanks and feet
Skin thickened and hyperkeratotic
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LiceExternal parasites
• Biting lice (1-6mm in length)
• Found
– Vent area, under wings, between feather tracts
– Very fast (Indy 500 race cars vs mites)
• Birds become unthrifty
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External parasites
• Prevention
– Assure new birds brought to farm are free of
external parasites (examine the birds)
– Control access from wild birds and rodents
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External parasites
• Treatment / control
– Spray coop with approved insecticide
– Dust (dust box or “shake and bake” in a gunny sack
– Spray bird(s) individually around vent area
– Products (read the label!!!)
• Malathion
• Pyrethrin based insectide
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Vaccination Programs
• Program A: Back yard flock, but “closed” (no
new introductions from off-farm).
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Vaccination Programs
• Program A: NOTHING!
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Vaccination Programs
• Program A - 1:
– Urban farmer (farmers market, show chickens, ETC)
– (Chicks come from recognized NPIP hatchery)
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Vaccination Programs
• Program A - 1:
– (Chicks come from recognized NPIP hatchery)
– Hatchery vaccination (day of age)
• Marek’s (HVT) plus Vectored IBDV
– (Infectious Bursal Disease Virus)
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Vaccination Programs
• Program A - 2:
• Urban farmer (farmers market, show chickens, ETC)
– (Chicks are hatched on site, not from a commercial
hatchery)
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Vaccination Programs
• Program A - 2:
• Urban farmer (farmers market, show chickens, ETC)
– (Chicks are hatched on site, not from a commercial
hatchery)
– Day of age: Marek’s Disease (Sub Q) back of neck
– MD-VAC CFL live HVT (Zoetis)
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Vaccination Programs• Program B - 1: Food Safety – Live program
– Day of age:
• Marek’s Disease (HVT/Vectored IBD
– Day of age:
• Salmonella, live S. typhimurium (coarse spray)
– 5 – 8 wks of age
• Salmonella, live S. typhimurium (coarse spray or water)
– 12 – 14 wks of age
• Salmonella, live S. typhimurium (coarse spray or water)
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Vaccination Programs• Program B - 2: Food Safety – Live / killed program
– Day of age:
• Marek’s Disease (HVT/Vectored IBD
– Day of age:
• Salmonella, live S. typhimurium (coarse spray)
– 5 – 8 wks of age
• Salmonella, live S. typhimurium (coarse spray or water)
– 12 – 14 wks of age
• Killed Salmonella SE (IM breast muscle)**
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Vaccination Programs
• Program C: All depends on the farm’s / flock’s
health history)
– These are in addition to the above programs.
• Pox, Infectious Laryngotracheitis,
• Cholera, Infectious Bursal Disease,
• See your poultry veterinarian.