Anoxia presentation Australia

Anoxia
Total absence of oxygen as the
principle of the N2GF technology
For more information: www.n2gf.com

Index
Part 1 Anoxia
Part 2 Killing and slaughter within the European framework
Directive EU 1099/2009

Part 3 Killing and the slaughter of animals using nitrogen foam
Part 4 Research projects
Part 5 Conclusions

2

Part 1

Anoxia


3

Anoxia, Hypoxia and Hemoglobin
• Anoxia is the condition characterized by complete absence
(or almost complete absence) of oxygen supply to the brain
• Hypoxia is the condition is characterized by insufficient
oxygen supply to the brain
• Hemoglobin protein in red blood cells which plays a crucial
role in the transportation of oxygen and other gasses
throughout the body


4

Five types of Anoxia
• Hypoxemic anoxia – high altitude
– Hypoxemic anoxia can happen during deep sea diving or at high altitude, when the
oxygen pressure outside the body is so low that hemoglobin in the red blood cells is
unable to absorb sufficient oxygen.

• Anemic anoxia - accident
– Anemic anoxia results from a decrease in the amount of hemoglobin in the blood, which
reduces the ability to get oxygen to the tissues, caused for instance by blood loss
(hemorrhage)

• Affinity anoxia – blood failure
– Affinity anoxia involves a defect in the chemistry of the blood such that the hemoglobin
can not release oxygen

• Stagnant anoxia – heart disease
– Stagnant anoxia occurs when the blood flow is blocked, although the blood and its
oxygen-carrying abilities are normal

• Histotoxic anoxia – narcotics and alcohol
– Histotoxic anoxia can also be caused by exposure to narcotics, alcohol etc.

5

Nitrogen Asphyxiation and its effects
• Nitrogen asphyxiation is a medical condition in which a person dies from
hypoxemic anoxia because the nitrogen concentration in his body is too
high
• When such asphyxiation begins, it only takes several breaths until it affects
the body’s oxygen supply: 1 minute of nitrogen exposure may cause a
person to fall unconscious and die in less than 10 minutes
• Until nitrogen exposure reaches a dangerous level, most persons don’t feel
stress or pain. Dying from high level nitrogen happens without warning or
immediately noticeable effects, unlike when a person dies from carbon
monoxide or carbon dioxide asphyxiation (they typically will become dizzy
and feel pain before dying).


6

Example:
Nitrogen asphyxiation and diving
•

Underwater, a diver must deal with two major issues: pressure and temperature. Pressure
affects the amount of nitrogen and oxygen gases that dissolve in the blood and tissues

•

Atmospheric air is a mixture of 21% oxygen and 78% nitrogen. When a person inhales air, the
body does nothing with the nitrogen: it only consumes the oxygen and replaces some of it
with carbon dioxide

•

When a diver descends under the water, the pressure on his body increases, so more
nitrogen and oxygen dissolve in his blood. Most of the oxygen gets consumed by his tissues,

but the nitrogen remains dissolved
•

When a diver reaches depths of about 30 m or more, he experiences a feeling of euphoria
called nitrogen narcosis: the nitrogen partial pressure reaches high levels, causing the
replacement of oxygen by nitrogen in the blood

•

Nitrogen narcosis can impair the divers judgment, make him feel relaxed or even sleepy

•

Narcosis comes on suddenly and without warning and when its not detected by a buddy
diver, it leads to drowning of the diver

7

Part 2

Killing and slaughter within the European framework


8

Killing and slaughtering animals
According to Directive EU 1099/2009
• Directive EU 1099/2009 is valid for all situations where
animals are killed or slaughtered:
– slaughtering of animals at the slaughter house
– mass culling during outbreak situations
– Killing of sick and crippled animals on the farm

• Basic principle: manually killing of animals is not allowed as
primary killing method
• Only 4 general types of killing techniques are allowed


9

General types of
killing techniques (1)
1. Mechanical methods
–
–
–
–
–
–

Penetrative captive bolt device
Non-penetrative captive bolt device
Firearm with free projectile
Maceration
Cervical dislocation
Percussive blow to the head

2. Electrical methods
– Head-only electrical stunning
– Head-to-Body electrical stunning
– Electrical waterbath


10

General types of
killing techniques (2)
3. Gas methods (hypoxia, hypoxemic anoxia, anoxia)
–
–
–
–
–
–

Carbon dioxide at high concentration
Carbon dioxide in two phases
Carbon dioxide associated with inert gases
Inert gases
Carbon monoxide (pure source)
Carbon monoxide associated with other gases

4. Other methods
– Lethal injection (T61)


11

Category 3:
Gas methods
A. Hypoxia

– CO2

A. Hypoxemic Anoxia

– CO2 + Argon

A. Anoxia

– Nitrogen


12

A: Hypoxia
• Most common gas method: Carbon dioxide
• CO2 in high concentration
• minimum concentration for poultry: > 40%
• Minimum concentration for pigs: > 80%

• Applied in various situations
•
•
•
•

Containers
Pits
Tunnels
Sealed-off buildings

• Various forms
• Compressed gas in Bottles
• Liquid gas in bulk tanks
• Dry ice


13

Hypoxia and the
effects on animals
• Animals are placed in a room (container/pit/tunnel or in a sealed off
building) that is flooded with CO2 that is heavier than air and cold (the
temperature of solid CO2 -dry ice- is -78C)
• With the raise of the CO2 level, the oxygen level in the room is deprived
• The animals notice that they are dying
• The animal is slowly but steadily confronted with lack of oxygen the
animals react before being unconscious by head shaking (heavy breathing)
and convulsions (lack of control over their nerve system)
• Some animals react to the raising level of CO2 by withholding their breath
as long as possible or try to climb to the highest point in the room
• The animals die by the effects of hypoxia


14

B: Hypoxemic Anoxia
• Most common gas combination: Carbon dioxide + Argon
• Mixture of different gasses
• minimum concentration for poultry: < 40% CO2
• Minimum concentration for stunning pigs: > 30% CO2 within 7 minutes max
• Minimum concentration for stunning poultry: > 30% CO2 within 3 minutes max

• Applied in various situations
•
•
•
•

Containers
Pits
Tunnels
Sealed-off buildings

• Various forms
• Compressed gas mixtures in Bottles
• Liquid gas mixtures in bulk tanks


15

Hypoxemic Anoxia and the
effects on animals
• Animals are placed in a room (container/pit/tunnel or in a sealed of
building) that is flooded with a mixture of CO2 + Argon
• In some cases, additional oxygen is added in the first minute to stimulate
the animals to maintain their breathing
• The animals notice that they are dying
• Like with pure CO2, the animal is slowly but steadily confronted with lack
of oxygen. The animals react before being unconscious by head shaking
(heavy breathing) and convulsions (lack of control over their nerve
system)
• Because of the gas mixture and the lower concentration of CO2, the lungs
are filled with a high concentration of Argon
• The animals die by the effects of hypoxic anoxia


16

C. Anoxia
• Techniques based on the exposure
concentration of more than 95% nitrogen
– Applied in gas chambers floated with high
concentrations of nitrogen
– Applied in high expansion foam: the N2GF
Method


17

Anoxia and the
effects on animals
• Animals are placed in a room (container/pit/tunnel or in a sealed of
building) that is flooded with gas foam, containing a concentration of
>95% Nitrogen
• The reaction of the animal to being submerged in foam is minimal
• The total absence of oxygen stays unnoticed
• The animals do not notice that they are dying
• Unlike hypoxia and hypoxic anoxia, the animals don’t react by head
shaking or perform convulsions prior to their unconsciousness
• After the animals are unconscious, their body reacts with convulsions
caused by the lack of control in the nerve system
• The animal dies after being submerged in the foam for 1,5 to 2 minutes


18

The three slaughter principles compared
• Hypoxia and Hypoxic anoxia methods:
– Large quantities of gas are needed to reach the gas level needed to
slaughter/kill the animals
– During the process of filling the room with gas, the animals notice that
the oxygen level slowly but steadily deprives
– Animals react prior to reaching the state of unconsciousness and their
reaction on the presence of CO2 (or a combination of CO2 and Argon)

• Anoxia methods:
– Only a fraction of nitrogen (compared to CO2/combination of
CO2+Argon) is needed to create an atmosphere of >95% nitrogen
– The animals don’t notice that they are in the process being killed or
slaughtered
– The animals are killed without any additional stress or pain caused by
the slaughter process

19

Part 3

Killing and slaughtering animals
using nitrogen foam


20

on slaughter by Anoxia
The European Union described Anoxia as an accepted gas method
(category 3) for the slaughter of poultry and pigs:
•
•
•

•

ANNEX I - LIST OF STUNNING METHODS AND RELATED SPECIFICATIONS (as
referred to in Article 4) CHAPTER I - Methods – table 3 – under 4:
Name: Inert Gas
Description: Direct or progressive exposure of conscious animals to a inert gas
mixture such as Argon or Nitrogen leading to anoxia. The method may be used in
pits, bags, tunnels, containers or in buildings previously sealed
Conditions of use: Pigs and poultry – slaughter - depopulation and other situations


21

Animals and nitrogen foam?
• Animals hardly show any stress reaction when they are submerged into
the foam:
– Touching the foam does not hurt
– Nitrogen is odorless and tasteless
– Foam is colorless

• As soon as the head of the animal submerges, it is exposed to a mixture of
> 95% nitrogen and <5% oxygen
• The first 20 – 25 seconds after being submerged, the animals still don’t
notice the absence of oxygen
– They maintain their normal breading
– They don’t show any muscle contractions

• After 20 to 25 seconds, the animals renders unconscious, resulting in the
start of the muscle contractions
• After 1 to 1,5 minutes, the high concentration of nitrogen in the blood
produces heart failure and mortality.

22

Description
nitrogen foam equipment
The standard equipment is attached
to the wall and consists of:
1. A nitrogen gas cylinder, including hoses
and a regulator
2. A pressure vessel for water and soap
mix, including water hoses
3. A foam nozzle in which nitrogen and
the water/soap solution are mixed
4. Measuring and control equipment to
monitor the gas concentration and
temperature
5. A standard barrel or container that is
filled with the nitrogen gas foam.


23

Benefits for farmers
• The nitrogen gas foam method is easy to integrate into procedures on the
farm, and given the absence of unnecessary pain and suffering, it is the
most humane killing method available
• Both the initial investment and operating costs are very low
• Stunning and killing of animals (pigs and poultry) by anoxia is accepted
according to the EU directive EU 1099/2009
• The direct involvement of the operator performing the killing of the
animals and the effect on him are minimized: low risk of error or failure minor psychological stress - low physical load
• The method is safe. The operator needs only to assure that his nose and
mouth are not in direct contact with the gas foam.


24

Simplified description of the standard procedure
to kill animals with nitrogen gas foam
The operator starts the procedure to produce the nitrogen foam:

• controls water and soap in the pressure vessel - checks gas reserves in the
nitrogen bottle - starts the foam production - places the cadaver barrel
below the foam nozzle - controls temperature and nitrogen concentration
in the foam
• makes his rounds through the stables and selects weak and sick animals
• removes these animals from the stable and transports them to the
cadaver barrel
• allows the animals one-by-one carefully through the top layer of the
nitrogen foam into the barrel at intervals of 2 minutes
• After all sick and weak animals are killed, the the cadaver barrel is closed.
The nitrogen foam dissolves completely in the course of time and the
concentration of nitrogen in the barrel easily disappears into the
atmosphere.

25

Special features
• Simplicity: control, cleaning and disinfection
• Cost effective: Low initial investment. Operational costs are very
low: only water, soap and nitrogen
• Stability of the foam: upper layer of foam (at least 40 cm) ensures
that the concentration of nitrogen that is located beneath the foam
layer remains high, in spite of the convulsions of the animal. The
nitrogen can not escape. Even during the time that the animal falls
through the upper foam layer, the concentration of nitrogen
remains intact
• Safety: nitrogen is an atmospheric gas - non toxic - safe to transport
- the soap has no adverse effects on humans and the environment
• Animal welfare: animal dies within 1.5 to 2 minutes as a
consequence of the absence of oxygen


26

Part 4

Research projects
Opinion of leading animal scientists on
Hypoxia and anoxia as slaughter technique


27

Anoxia
Scientific research projects
Overview resent research projects (from 2006 until today) on Anoxia and
slaughter:
• Dr. Marien Gerritzen (Anoxia caused by nitrogen foam)
• Dr. Dorothy McKeegan (Anoxia caused by nitrogen foam)
Overview resent research projects on Hypoxemic anoxia:
• Dr. Mohan Raj (Hypoxemic anoxia by a gas mix of CO2 and argon)


28

Dr. Marien Gerritzen
WUR University of Wageningen
Summary, page 11:
‘The use of high expansion gas-filled foam
containing CO2 or an Anoxic gas such as
Nitrogen presents a feasible alternative
delivery method of hypercapnic or anoxic
killing, because as the foam envelopes the
bird, oxygen will be effectively eliminated and
or carbon dioxide will be effectively presented
and birds will die by hypercapnic-anoxia or by
anoxia.’

For the full text of the report, visit www.N2GF.com


29

Dr. Dorothy McKeegan
University of Glasgow,
College of Medical, Veterinary & Life Sciences
Presentation: Gasfoam - a humane
agent? (Oct ‘11), conclusions, page 10:
‘Collectively, the results show that
anoxic foam has the potential to be a
reliable and humane method of
emergency killing for poultry.’

For the full text of the report, visit www.N2GF.com


30

Dr. Mohan Raj
Bristol University,
Bristol Veterinary school
HSUS Report: The Welfare of Birds at
slaughter - Conclusions - page 8:
Comparing electrocution and hypoxemic
anoxia using a mixture of CO2 and Argon:

‘After a comprehensive review of the
scientific literature, the Scientific Panel on
Animal Health and Welfare, an official
advisory body to the European Commission,
(EFSA) stated:
Since welfare is poor when the shackling line
and water bath electrical stunning method is
used, and birds are occasionally not stunned
before slaughter, the method should be
replaced as soon as possible. At present, the
inert gas stun/killing method is the best
alternative.’
For the full
For more information: www.n2gf.com text of the report, visit www.N2GF.com
31

The technique
behind the N2GF method
The N2GF technique is based on the principle of Anoxia:
–
–
–
–
–

High expansion foam bubbles are created, using a nozzle
The water/soap mix is composed by 95% water and 5% soap
The foam bubble is filled with >95% nitrogen
The animals are covered with a layer of foam
Form one moment to the other, the animal is confronted with the total
absence of oxygen without noticing
– The animal stays completely calm and doesn’t show any convulsions
until its unconscious. From that moment on, the convulsions start
– After being unconscious, the animal dies, caused by Anoxia


32

Part 5

Conclusions


33

Conclusions
• The gas foam technique is the only universal killing technique,
because it is based purely on Anoxia
• Killing and slaughtering with gas foam does not create
additional stress or pain
• The influence of humans is minimalized using gas foam
• Gas foam is efficient and (cost) effective and cheap to apply
• Gas foam can be applied on single (sick and injured) animals
on the farm, as well as to large numbers of animals during
outbreaks of diseases

34

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