Difference between revisions of "Coccidia - Poultry"

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[[Image:Buff orpington.jpg|thumb|right|150px|Buff orpington - nabrown RVC]]
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#redirect[[Coccidiosis - Poultry]]
[[Image:Eimeria Sporulated.jpg|thumb|right|150px|Sporulated ''Eimeria'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
 
 
Domestic poultry and birds are affected by coccidia called Eimeria. Different species of Eimeria that effect poultry are host-specific – meaning that a species that infects chickens does not infect turkeys and vice versa.
 
 
 
Nine species of Eimeria infect chickens. The species important in broiler production include Eimeria tenella (90%), E. maxima, E. acervulina, and E. mivati; the species important in breeder and egg- layers are E. burnetti and E. necatrix. Seven species infect turkeys – the big three of concern are Eimeria meleagrimitis, E. adenoeides, and E. gallapovonis.
 
 
 
*Direct life cycle
 
 
 
*1 week prepatent period
 
 
 
*After oocysts are ingested, sporozoites are released which penetrate the intestinal epithelium
 
 
 
*2 asexual phases of multiplication called schizogony occur followed by a phase of sexual multiplication called gametogony
 
 
 
*Zygote develops into an oocyst which is then shed in the faeces
 
**Oocyst measures 20-30μm
 
 
 
*For each oocyst ingested, thousands are shed
 
 
 
*Life cycle is '''self-limiting'''
 
**Organisms from a single infection go through the sequence of developmental stages synchronously
 
**Organisms leave the body simultaneously as oocysts
 
 
 
*Oocysts are only infective once they have sporulated
 
**Sporulation requires warmth, moisture and oxygen
 
**Takes 2-3 days in broiler houses
 
 
 
*Oocysts contain 4 sporocysts each with 2 sporozoites
 
 
 
[[Category:Coccidia]][[Category:Poultry]]
 
[[Category:To_Do_-_Stuartd]]
 

Latest revision as of 11:15, 28 March 2011