Welfare implications of bacterial and viral infectious diseases for laying hens
Amir H. Noormohammadi
Veterinary Clinical Centre, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, 250 Princes Highway, Werribee, Vic. 3030, Australia. Email: Amirh@unimelb.edu.au
Animal Production Science 61(10) 1018-1030 https://doi.org/10.1071/AN19595
Submitted: 18 October 2019 Accepted: 12 March 2020 Published: 10 February 2021
Abstract
Bacterial and viral infectious diseases are significant welfare concerns as they cause a range of clinical signs and mortality depending on the body system(s) affected and severity of the disease. Basic skills in the detection of the clinical signs in poultry and provisional diagnosis of the infectious disease is important for the immediate course of action that needs to be taken to eliminate or reduce the impact of the disease on bird’s welfare. Therefore, in this chapter, bacterial and viral diseases of laying hens (chickens) have been described on the basis of their clinical signs and lesions, as opposed to the classes of infecting bacterial or viral agents. Diseases causing sudden death, respiratory illness, ill thrift, diarrhoea, lameness or recumbency, and reduced egg production and quality are discussed.
Keywords: clinical signs, diarrhoea, feather conditions, ill thrift, infectious diseases, lameness, mortality, neurological signs, poultry, respiratory illness, skin diseases.
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