Occurrence of Salmonella spp.: a comparison between indoor and outdoor housing of broilers and laying hens

Published on: 08/19/2019
Author/s : Martin Wierup 1, Helene Wahlström 2, Elina Lahti 2, Helena Eriksson 4, Désirée S. Jansson 4, Åsa Odelros 3 and Linda Ernholm 2.

BackgroundSalmonella is a major food borne pathogen which globally is estimated to cause 93 million enteric infections and 155,000 diarrheal deaths each year [1]. Poultry products are a significant source which initially was considered to be a consequence of the global introduction of industrialized production of broiler chickens around some 50  years ago [2]. In the late 1980s, the emerging ...

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George Arzey George Arzey
Veterinary Doctor
August 21, 2019

It is beneficial to view the results of this 9-year study in conjunction with extensive published reviews that concluded that there is no consensus regarding the impact that cage, barn and free-range egg production has on Salmonella contamination of eggs (Holt et al 2011 and Whiley et al 2015). An Australian report indicated that fewer free-range flocks than indoor flocks were found to be environmentally Salmonella positive (Safe Food Qld 2015). Another (NSWFA 2013) reported that single tier cage farms were with the lowest Salmonella prevalence (10%), followed by free-range farms with moveable sheds (34%), free range fixed sheds (50%), multi-tier cages and barn (100%). Among other variables, the type of the indoor housing (e.g. multi-tier vs single tier) and the outdoor housing (e.g. fixed vs moveable) as well as the ventilation system (controlled environment vs natural ventilation) may play a role. The current considerable evidence does not support the perceived higher risk associated with outdoor systems. All layer hens regardless of their housing should be regularly monitored. Should we be reminded that the epidemics of Salmonella enteritidis emerged long before the trend towards a better welfare outcome for hens? References 1. Holt et al (2011) Poultry Science, Vol 90, Issue 1, https://academic.oup.com/ps/article/90/1/251/1513625 2.Whiley et al (2015) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4377917/ 3. Safe Food Qld (2015) Salmonella survey of the Queensland egg production environment http://esvc000111.wic055u.server-web.com/images/PDF/2015%20Microbiological%20survey%20of%20Queensland%20egg%20farms.pdf 4. NSWFA (2013) Baseline evaluation of the NSW Egg Food Safety Scheme – microbiological survey of egg farms in NSW http://www.foodauthority.nsw.gov.au/_Documents/scienceandtechnical/egg_baseline_micro_survey.pdf

Nyunt Shwe Nyunt Shwe
Poultry farmer
August 29, 2019
Thank for giving information.
Alagbe olujimi John Alagbe olujimi John
Animal Production & Health
August 30, 2019
Ability to prevent most of these pathogens will reduce mortality and cost of production. Thanks for the vital information.
September 30, 2019

Actually the climatic condition of the study area is not stated, but the environment has a great effect on the survival of the pathogens. The environment should be considered. Environmental (tropic and temperate) comparative study is required to conclude. Thanks. Dr. Asheikh

October 22, 2019
Please suggest a treatment for a broiler flock age 8 days old chick also suggest some other related preventive measures.
October 23, 2019
Why the salmonella infected consumes more feed and water?
Else than fever!
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Dr. Sahil Kalia, Ph.D.
Dr. Sahil Kalia, Ph.D.
PhD, Postdoc, Cornell University, USA
  Ithaca, New York, United States
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