Welfare assessment of novel on-farm killing methods for poultry

Jessica E Martin*, Victoria Sandilands, Julian Sparrey, Laurence Baker, Laura M Dixon, Dorothy E F McKeegan

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)
3 Downloads (Pure)

Abstract

There is a need for novel mechanical devices for dispatching poultry on farm following the introduction of EU Regulation (EC) no. 1099/2009 On the Protection of Animals at the Time of Killing. We examined three novel mechanical killing devices: Modified Armadillo, Modified Rabbit Zinger, a novel mechanical cervical dislocation device; and traditional manual cervical dislocation. The four killing methods were tested on 230 chickens across four batches. We measured behavioural, electroencephalogram and post-mortem outcomes in anesthetized laying hens and broilers at two life stages (juveniles and adults/slaughter age). Graeco Latin-Square designs systematically randomized killing treatment, bird type, age and kill order. All birds were lightly anaesthetized immediately prior to the killing treatment with inhalation of Sevoflurane. The novel mechanical cervical dislocation method had the highest kill success rate (single application attempt only, with no signs of recovery) of a mechanical method (96%). The Modified Armadillo was the least reliable with 49% kill success. Spectral analysis of electroencephalogram signals at 2 s intervals for successfully killed birds only revealed progressive decreases in median frequency alongside increases in total power. Later, total power decreased as the birds exhibited isoelectric electroencephalogram signal. Latencies to pre-defined spectral ranges associated with unconsciousness showed that birds subjected to manual and novel mechanical cervical dislocation achieved these states sooner than birds subjected to the modified Armadillo. Nevertheless all methods exhibited short latencies (<4 s). The Modified Rabbit Zinger had the shortest duration of reflex persistence for nictitating membrane, pupillary and rhythmic breathing post method application. Of the methods tested, the novel mechanical cervical dislocation device is the most promising mechanical method for killing poultry on-farm based on a range of behavioural, electroencephalogram and anatomical parameters. This device has the potential to fulfil the current need for a mechanical alternative to manual cervical dislocation.

Original languageEnglish
Article numbere0212872
JournalPLoS ONE
Volume14
Issue number2
Early online date22 Feb 2019
DOIs
Publication statusFirst published - 22 Feb 2019

Fingerprint

Poultry
Birds
Armadillos
Electroencephalography
Equipment and Supplies
Nictitating Membrane
Rabbits
Unconsciousness
Farms
Inhalation
Reflex
Chickens
Respiration
Therapeutics

Keywords

  • Birds
  • Reflexes
  • Brain damage
  • Poultry
  • Skull
  • Brainstem
  • Anesthetics

Cite this

Martin, Jessica E ; Sandilands, Victoria ; Sparrey, Julian ; Baker, Laurence ; Dixon, Laura M ; McKeegan, Dorothy E F. / Welfare assessment of novel on-farm killing methods for poultry. In: PLoS ONE. 2019 ; Vol. 14, No. 2.
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Welfare assessment of novel on-farm killing methods for poultry. / Martin, Jessica E; Sandilands, Victoria; Sparrey, Julian; Baker, Laurence; Dixon, Laura M; McKeegan, Dorothy E F.

In: PLoS ONE, Vol. 14, No. 2, e0212872, 22.02.2019.

Research output: Contribution to journalArticle

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T1 - Welfare assessment of novel on-farm killing methods for poultry

AU - Martin, Jessica E

AU - Sandilands, Victoria

AU - Sparrey, Julian

AU - Baker, Laurence

AU - Dixon, Laura M

AU - McKeegan, Dorothy E F

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AB - There is a need for novel mechanical devices for dispatching poultry on farm following the introduction of EU Regulation (EC) no. 1099/2009 On the Protection of Animals at the Time of Killing. We examined three novel mechanical killing devices: Modified Armadillo, Modified Rabbit Zinger, a novel mechanical cervical dislocation device; and traditional manual cervical dislocation. The four killing methods were tested on 230 chickens across four batches. We measured behavioural, electroencephalogram and post-mortem outcomes in anesthetized laying hens and broilers at two life stages (juveniles and adults/slaughter age). Graeco Latin-Square designs systematically randomized killing treatment, bird type, age and kill order. All birds were lightly anaesthetized immediately prior to the killing treatment with inhalation of Sevoflurane. The novel mechanical cervical dislocation method had the highest kill success rate (single application attempt only, with no signs of recovery) of a mechanical method (96%). The Modified Armadillo was the least reliable with 49% kill success. Spectral analysis of electroencephalogram signals at 2 s intervals for successfully killed birds only revealed progressive decreases in median frequency alongside increases in total power. Later, total power decreased as the birds exhibited isoelectric electroencephalogram signal. Latencies to pre-defined spectral ranges associated with unconsciousness showed that birds subjected to manual and novel mechanical cervical dislocation achieved these states sooner than birds subjected to the modified Armadillo. Nevertheless all methods exhibited short latencies (<4 s). The Modified Rabbit Zinger had the shortest duration of reflex persistence for nictitating membrane, pupillary and rhythmic breathing post method application. Of the methods tested, the novel mechanical cervical dislocation device is the most promising mechanical method for killing poultry on-farm based on a range of behavioural, electroencephalogram and anatomical parameters. This device has the potential to fulfil the current need for a mechanical alternative to manual cervical dislocation.

KW - Birds

KW - Reflexes

KW - Brain damage

KW - Poultry

KW - Skull

KW - Brainstem

KW - Anesthetics

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DO - 10.1371/journal.pone.0212872

M3 - Article

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VL - 14

JO - PLoS ONE

JF - PLoS ONE

SN - 1932-6203

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ER -