Causes of mortality in laying hens in different housing systems in 2001 to 2004.

Acta Veterinaria Scandinavica
Oddvar FossumIvar Vågsholm

Abstract

The husbandry systems for laying hens were changed in Sweden during the years 2001 - 2004, and an increase in the number of submissions for necropsy from laying hen farms was noted. Hence, this study was initiated to compare causes of mortality in different housing systems for commercial laying hens during this change. Based on results from routine necropsies of 914 laying hens performed at the National Veterinary Institute (SVA) in Uppsala, Sweden between 2001 and 2004, a retrospective study on the occurrence of diseases and cannibalism, i.e., pecking leading to mortality, in different housing systems was carried out. Using the number of disease outbreaks in caged flocks as the baseline, the expected number of flocks with a certain category of disease in the other housing systems was estimated having regard to the total number of birds in the population. Whether the actual number of flocks significantly exceeded the expected number was determined using a Poisson distribution for the variance of the baseline number, a continuity correction and the exact value for the Poisson distribution function in Excel 2000. Common causes of mortality in necropsied laying hens included colibacillosis, erysipelas, coccidiosis, red mite infest...Continue Reading

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Methods Mentioned

BETA
PCR

Software Mentioned

Excel

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