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Helminth infection is associated with hen mortality in Danish organic egg production

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Helminth infection is associated with hen mortality in Danish organic egg production. / Hinrichsen, Lena Karina; Labouriau, Rodrigo; Engberg, Ricarda M; Knierim, Ute; Sørensen, Jan Tind.

I: Veterinary Record, Bind 179, Nr. 8, 23.08.2016, s. article 196.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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@article{366a369cb1bb41ceb6171340ce684bc1,
title = "Helminth infection is associated with hen mortality in Danish organic egg production",
abstract = "The aim of this study was to investigate whether two highly prevalent helminth infections (Ascaridia galli and Heterakis species) are associated with an increased mortality rate for hens at the peak of lay. An observational event study with 11 farms was conducted between 2012 and 2013, with weekly mortality recordings and grouping of the farms into low-infected with A galli and Heterakis species (0–200 epg of faeces) or high-infected (over 200 epg of faeces). Survival analysis was performed using a discrete time proportional hazards model. The difference between the hazard functions for low-infected farms and high-infected farms in either summer (August to September) or winter ( January to March) were analysed. No statistically significant associations were found between the mortality rate in winter and summer in low-infected farms. However, the mortality rate was doubled for hens from high-infected farms observed in the summer season compared with hens from low-infected farms (winter and summer), whereas high-infected farms observed in the winter did not have a significant association between mortality rate and season compared with low-infected farms (summer and winter). The results suggest that the mortality in organic egg production may be reduced by measures to control A galli and Heterakis species infections.",
author = "Hinrichsen, {Lena Karina} and Rodrigo Labouriau and Engberg, {Ricarda M} and Ute Knierim and S{\o}rensen, {Jan Tind}",
year = "2016",
month = aug,
day = "23",
doi = "10.1136/vr.103614",
language = "English",
volume = "179",
pages = "article 196",
journal = "Veterinary Record",
issn = "0042-4900",
publisher = "B M J Group",
number = "8",

}

RIS

TY - JOUR

T1 - Helminth infection is associated with hen mortality in Danish organic egg production

AU - Hinrichsen, Lena Karina

AU - Labouriau, Rodrigo

AU - Engberg, Ricarda M

AU - Knierim, Ute

AU - Sørensen, Jan Tind

PY - 2016/8/23

Y1 - 2016/8/23

N2 - The aim of this study was to investigate whether two highly prevalent helminth infections (Ascaridia galli and Heterakis species) are associated with an increased mortality rate for hens at the peak of lay. An observational event study with 11 farms was conducted between 2012 and 2013, with weekly mortality recordings and grouping of the farms into low-infected with A galli and Heterakis species (0–200 epg of faeces) or high-infected (over 200 epg of faeces). Survival analysis was performed using a discrete time proportional hazards model. The difference between the hazard functions for low-infected farms and high-infected farms in either summer (August to September) or winter ( January to March) were analysed. No statistically significant associations were found between the mortality rate in winter and summer in low-infected farms. However, the mortality rate was doubled for hens from high-infected farms observed in the summer season compared with hens from low-infected farms (winter and summer), whereas high-infected farms observed in the winter did not have a significant association between mortality rate and season compared with low-infected farms (summer and winter). The results suggest that the mortality in organic egg production may be reduced by measures to control A galli and Heterakis species infections.

AB - The aim of this study was to investigate whether two highly prevalent helminth infections (Ascaridia galli and Heterakis species) are associated with an increased mortality rate for hens at the peak of lay. An observational event study with 11 farms was conducted between 2012 and 2013, with weekly mortality recordings and grouping of the farms into low-infected with A galli and Heterakis species (0–200 epg of faeces) or high-infected (over 200 epg of faeces). Survival analysis was performed using a discrete time proportional hazards model. The difference between the hazard functions for low-infected farms and high-infected farms in either summer (August to September) or winter ( January to March) were analysed. No statistically significant associations were found between the mortality rate in winter and summer in low-infected farms. However, the mortality rate was doubled for hens from high-infected farms observed in the summer season compared with hens from low-infected farms (winter and summer), whereas high-infected farms observed in the winter did not have a significant association between mortality rate and season compared with low-infected farms (summer and winter). The results suggest that the mortality in organic egg production may be reduced by measures to control A galli and Heterakis species infections.

U2 - 10.1136/vr.103614

DO - 10.1136/vr.103614

M3 - Journal article

C2 - 27436011

VL - 179

SP - article 196

JO - Veterinary Record

JF - Veterinary Record

SN - 0042-4900

IS - 8

ER -