aviculture au maroc

 

study of poultry projects

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Coccidiosis

 

 

 

 

Introduction

 

This was at one time the commonest type of coccidiosis and is certainly the most easily diagnosed. It is caused by Eimeria tenella and results in lesions in the caecum of chickens worldwide. Morbidity is 10-40% and mortality up to 50%. Transmission as for E. mitis (see above).

 

Signs

 

- Depression.

- Ruffled feathers.

- Closed eyes.

- Inappetance.

- Diarrhoea, blood in faeces.

- Production less affected than in some of the other forms of coccidiosis.

 

Post-mortem lesions

 

- Petechiae.

- Thickening, ecchymoses, of caecal mucosa.

- Accumulation of varying quantities of blood and caseous necrotic material in the caecum.

 

Diagnosis

 

Signs, lesions, microscopic examination of scrapings. Differentiate from ulcerative enteritis, histomonosis.

 

Treatment

 

Toltrazuril, Sulphonamides, Amprolium, Vitamins A and K in feed or water.

 

Prevention

 

Coccidiostats in feed, vaccination by controlled exposure, hygiene. E. tenella is more common when 'straight' ionophore programmes are used. Shuttle programmes with chemicals in the starter diet usually improve control. In some markets the organic arsenical compound 3-Nitro is used as an aid in the control of caecal coccidiosis. Vaccines are used mainly in breeders but increasingly in broilers. Recovered birds have good immunity to the same parasite.

 

 

Lesions and types

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose

 

coccidiose