POPM 4230 Lecture Notes - Lecture 6: Coronavirus, Egg White, Oviduct
19 Jan 2017
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Document Summary
Ib = an acute, highly contagious resp disease of chickens caused by ibv, which is a corona virus. Several variants exist, and variations in virulence have been reported. Clinical signs vary and depend on the age of the bird, host immune status, and virulence of the virus. Disease can vary from asymptomatic (no clinical signs) to involvement of the resp, renal, and reproductive organs. Early sings include depression, ruffled feathers, and huddling near heat sources. W. in 24 hours, signs of resp disease can be observed, including cough, sneezing, nasal discharge, and gasping (and resp distress) Reduced feed intake and poor weight gain might be observed. In flocks >6 wks of age, signs are similar but may be less severe and may be so subtle that they are only observed at night when birds are normally quiet. In laying hens, egg production may drop by up to 50%
