|
|
| (8 intermediate revisions by 3 users not shown) |
| Line 1: |
Line 1: |
| − | [[Image:Buff orpington.jpg|thumb|right|150px|Buff orpington - nabrown RVC]] | + | #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_-_Clinical]]
| |