Poultry diseases: Flashcards
Origin of Fowl Cholera
Virulence of P.multocidia (carrier ) + predisposing factors
- Clinical signs within 24.hours= can be originated back before delivery
- After 24.hours= was there any outbreak at seller, during previous years?
- Has/ Did he informed the buyer about outbreaks
- Other sources of infection at the buyer= isolation , all-inn all out
- Predisposing factors= transport, force feeding
Significance of Fowl Cholera
1) Depending on death rates
2) Spread via egg-shell
3) NO GERMINATIVE infection
Origin of Avian leucosis
- Clinical signs only in case of infection before 10.weeks old
- if animals are above >10.weeks= orginated back to before delivery
- if animals are below <10.weeks= germinative or contact infection= epidemic investigation
Significance of Avian leucosis
1) Sporadic deaths
2) Breeding flocks= germinative infection
3) Always significant
4) Immunotolerence= life long shedders
5) Table egg prod
Origin of Mareks
- Age of susceptibility= 10.weeks
- Route of infection= Egg-shell, day olds, adult, person, equipments
- Incubation period 1-7.months
- The younger that chicks, higher susceptibility
- High rate of diseased animals= infection during the first days of live
- Infection at hatchery= isolated until 6-8.weeks old
Significance of Mareks
1) Depending on death rates (2%)
2) NO GERMINATIVE INFECTION
Diagnosis of Mareks
- Acute
- Chronic
- Clinical signs
- Patho / Histopath
Origin of Fowl typhoid—-notifiable
- Death during the first 5.days= originated back to hatchery
- Breeding flocks= if hatchery complied the rules (markings, separations etc)
- Test= blood + examination of dead eggs
- Death after 5.days=epidemic investigation
Significance of Fowl typhoid
1) Infection= breeding flocks should be free from Salmonella
2) Disease= broiler chicks (2% death rate)
3) Breeding flocks= GERMINATIVE, 1 case is significant enough
Orgin of Derzsy –Geese parvi
- High death rate= GERMINATIVE infection or infection at hatchery
- Incubation period= 8-12days
- Give serum first day of hatchery
- Isolation of day-old gooslings
- Vaccination of breeding flocks
Significance of Derszy
1) Breeding flocks= Germinative
2) Broiler= if loss is above 2%
Origin of Mushy chicken disease
-Death of day-old chickens, under the age of 10.days old can be originated back to hatchery
Significance of Mushy chicken disease
-Depends on the death rate losses
Diagnosis of Mushy chicken disease
- Clinical signs= weak, low body weight
- Pathology
- Mortality= 1-10 days old
- Lab examination
Fertility of EGG
In the hatching eggs there ar viable embryo
- Sex rate
- Age
- Temp
- Lenght + intensity og lighting
- Infectious/ non infectious diseases
- Feed toxicosis