Meat+Poultry - March 2017 - 96

A N I M A L W E L FA R E

CO 2 STUNNING FOR HOGSĀ 

The elimination of gestation
crates for pregnant sows
continues to be a hot-button
animal welfare topic.

96

the list of items for continuing improvement.
Stocking densities, lighting programs, muscle
myopathies, and use of antibiotics are also
areas that require research attention.
"In the egg layer industry, the key challenge
is housing, with the industry undergoing a shift
from conventional cage housing to alternatives
like enriched colonies or cage free housing.
While these alternative systems have hen welfare
advantages, there are also welfare disadvantages,
and it is also essential to address associated
issues including economic, environmental, egg
safety, and worker health impacts."
Matt Prescott, senior director of Food
Policy for HSUS, acknowledges the recent
progress made by the meat industry, and also
sees elements of poultry welfare as the next big
challenge on the table: "Probably the biggest
thing going on in this space right now is, for
the very first time, major companies requiring
substantial welfare improvements from their
chicken suppliers. Rising to meet this growing
demand," he continues, "and getting out in
front of it, for better breeding, housing and
slaughtering practices is a great topic."

MEAT+ POULTRY | 03.17 | www.meatpoultry.com

MASS EUTHANASIA
Individual euthanasia in production systems is
normally handled in a slaughter plant's animal
welfare program. This includes, for example,
a cow or pig that is injured or sick that doesn't
pass ante-mortem inspection.
In the 2015 avian influenza outbreak, flocks
of laying hens numbering in the millions were
depopulated, bringing focus to the challenge
of mass euthanasia. Depopulation methods
include mass suffocation and death by heat
stress, which are neither quick nor painless.

Shutterstock

There are a number of
animal welfare challenges
still in the poultry industry
including the use of
antibiotics and raising
the animals cage free.

Kurt Vogel, the Kraft/Oscar Mayer faculty
scholar at the Univ. of Wisconsin-River Falls,
points to the CO2 stunning of hogs as an
important area to continue to work on.
"I think we need to keep working on how
animals respond to controlled atmosphere
stunning systems," he says. "In particular,
we've really got to look at what's going on in
the pit for CO2 stunning systems for hogs. To a
large extent we don't know what their behavior
looks like when they dip down into the pit.
There are pigs that respond aversely to CO2, and
they'll display escape behavior when they go
into the pit, and that's an indication that they're
experiencing distress during that process.
"I think genetics could be a significant piece
of the puzzle; in humans, some people will
react very aversely to CO2 exposure, high dose
because it burns, whereas other people won't
pick it up."
Vogel says other gases besides CO2 need to be
examined. "One of the things we need to continue
to explore is the use of gas blends, where gases
besides CO2 may be more inert for the animal."


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Meat+Poultry - March 2017

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Meat+Poultry - March 2017 - 1
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https://digital.meatpoultry.com/sosland/mp/meatpoultry-october-2021
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