By J.L. Vegad
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Additional resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
Yolk sac infection in a IO-day-old broiler chicken. Note markedly infected yolk sac (arrow). Fig. 48. Two infected yolk sacs from two different I O-day-old broiler chickens. 36 BACTERIAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 49. Yolk sac infection in a 4-day-old chick. Note yolk sac is distended, hyperaemic (showing prominent vessels) , and filled with abnormal brown watery contents (arrow). Fig. 50. Omphalitis (inflammation of navel) and yolk sac infection in three 3day-old chicks. Navels are inflamed and yolk sacs distended with abnormal contents (arrows).
Fowl pox usually causes weakness and poor weight gain. In layers, egg production is temporarily stopped . Mortality is low (I to 2%) when skin lesions are present, but may be as high as 50% with the diphtheritic form , but is usually low. Diagnosis Wart-like lesions of the head particularly of the comb and around the eyes, or yellow cheesy lesions in the larynx and adjacent trachea on postmortem, are diagnostic of fowl pox. 23 VIRAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Treatment There is no satisfactory treatment.
Symptoms I. The respiratory form is the most common in birds of all ages. The symptoms include abnormal respiratory sounds, severe respiratory distress (Fig. 41), gasping and sneezing, watery nasal discharge, and sometimes eye discharge and facial swelling. 2. In the reproductive form, there is reduced egg production. Drop in production may sometimes be more than 50%. Egg production may become normal after 3-4 weeks, but there is a fall in egg quality. Eggs may be smaller, deformed (Fig. 42), shell-less (Fig.
A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad