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A Colour Atlas of Poultry Diseases: An Aid for Farmers and by J.L. Vegad

By J.L. Vegad

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Fig. 33. Marek's disease (acute form) from the same 29-week-old layer chicken shown in Fig. 32. The proventriculus is now cut open and reveals irregular, somewhat diffuse, blotchy haemorrhages. Its wall is thickened . 21 VIRAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 34 . Marek's disease (acute form) in a 19-week-old grower chicken . Note proventriculus (on the right) is thickened and shows diffuse haemorrhages on its inner surface. Spleen, on the left, is greatly enlarged and shows tumour lesions on its surface (faintly yellowish areas).

67) reveals their internal changes. Fig. 67. Necrotic enteritis in the caeca of three 18-day-old broiler chickens shown in Fig. 66. The caeca are cut open. Their closer view reveals that they are greatly thickened and their internal surfaces are lined by a loose to tightly attached yellow layer (a false membrane). Areas of small haemorrhages and patches of blood are usually present. 47 BACTERIAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 68. Necrotic enteritis in the caeca of a lO-day-old broiler chicken.

All the conditions are collectively called 'Colibacillosis'. E. coli causes disease only when there is a serious managemental fault, or some other underlying diseaseproducing organism like Mycoplasma is present. Thus, f. coli infection occurs when bird's defences have been damaged or defeated. I. Yolk Sac Infection Yolk sac infection is the commonest cause of mortality in chicks during the first week after hatching (early chick mortality). Faecal contamination of the eggs is the most important source of infection.

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