J.L. Vegad's A Colour Atlas of Poultry Diseases: An Aid for Farmers and PDF
By J.L. Vegad
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Extra resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
Pullorum . 3. Affected chicks shed S. pullorum through the faeces. This is the major method of spread among chicks. 4. Contaminated feed, water and litter can also be a source of S. pullorum infection. 5. Attendants, visitors, feed dealers, and chicken buyers who move from house to house and from farm to farm, may carry infection. Symptoms I. Pullorum disease is mainly a disease of chicks. It is seen in chicks below 3 weeks of age. The first indication is usually a large number of dead-in-shell chicks, and deaths soon after hatching.
This is characteristic of the advanced stage of E. coli infection. 40 BAC T ERIAL DISEASES A COLOUR ATLAS OF POULTRY D ISEASES Fig. 57. f. coli infection (Colisepticaemia) in another 34-day-old broiler chicken. Note thick white fibrin layer covering the heart and liver, typical of advanced f. coli infection. Fig. 58. E. coli infection (Colisepticaemia) in yet two other 34-day-old broiler chickens showing thick white fibrin layer on the liver and heart, characteristic of advanced E. coli infection .
Marek's disease (acute form) from the same 19-week-old grower chicken shown in Fig. 34. Note that, besides diffuse haemorrhages in the proventriculus (white arrow) and enlarged spleen, small intestine shows the presence of a tumour (black arrow) . 22 A COLOUR ATLAS OF POULTRY DISEASES VIRAL DISEASES FOWL POX F owl pox is a viral disease characterized by skin lesions (changes). Although there is another form of the disease, in which changes appear in the mouth and upper respiratory tract, this form of the disease is also usually associated with skin changes in some birds.
A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad