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Type: Journal article
Title: Pig-shed air polluted by α-haemolytic cocci and ammonia causes subclinical disease and production losses
Other Titles: Pig-shed air polluted by alpha-haemolytic cocci and ammonia causes subclinical disease and production losses
Author: Murphy, T.
Cargill, C.
Rutley, D.
Stott, P.
Citation: Veterinary Record, 2012; 171(5):1-6
Publisher: British Veterinary Assoc
Issue Date: 2012
ISSN: 0042-4900
Statement of
T. Murphy, C. Cargill, D. Rutley, P. Stott
Abstract: There is mounting evidence that bacteria originating from pigs degrade the environment of the pig shed and adversely affect the health of the animals and the pig-shed workers. α-haemolytic cocci (AHC) occur in pig-shed environments, but are regarded as commensals. Ammonia is also a component of the pig-shed environment, and is known to damage upper respiratory tract epithelia. The aim of this study was to determine whether polluted air in pig sheds adversely affected performance indicators in pigs. Modelling revealed a direct effect of AHC on voluntary feed intake and hence AHC are not commensal. No direct effect of ammonia on the pigs was detected, but the combination of AHC and ammonia stimulated the immune system in a progressive manner, and there were direct effects of immune stimulation on food intake and growth resulting in poorer feed-conversion efficiency, even though the effects remained subclinical. The authors conclude that exposure of the respiratory epithelia of pigs to viable AHC in the presence of ammonia redirects nutrients away from production and towards the immune system, explaining the impact of poor pig-shed hygiene on production parameters.
Keywords: Animals; Swine; Humans; Streptococcus; Ammonia; Hygiene; Air Microbiology; Housing, Animal; Animal Welfare; Animal Husbandry; Female; Aerococcus
Description: Originally published online June 15, 2012
Rights: Copyright status unknown
RMID: 0020121514
DOI: 10.1136/vr.100413
Appears in Collections:Animal and Veterinary Sciences publications

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