Anoxia – Applying the technique

Anoxia technique


High expansion foam

The Anoxia technique is unique for creating an environment without oxygen under atmospheric circumstances. High expansion foam is produced by mixing nitrogen, a mixture of water and specially developed high expansion detergent. The expansion rate is upto 1:1000, meaning that 1 litre of water/foam agent mix expands up to 1 m3 foam. Due to the specially designed foam generator, the high expansion foam bubbles are filled with a > 99% concentration of nitrogen. Therefore, the oxygen level surrounding the animal drops from 21% in atmospheric air to < 1 % once the animal is submerged in the foam.

Convulsions, but no stress or pain

The animals need a constant supply of oxygen to the brain. Applying Anoxia foam, the oxygen is replaced by nitrogen. As a result the nitrogen level is raised to > 99% and the oxygen level is lowered to < 1%. Considering the natural reaction to sudden lack of oxygen the animal is rendering quickly into unconsciousness. As a consequence, behavioral indicators like loss of posture and convulsions will appear. With this in mind, unconscious animals are insensitive to perceive unpleasant sensations like pain.

How Anoxia foam is created

First of all, a mixture of 97% water and 3% high expansion foam agent is sprayed into the Anoxia foam generator, creating a thin film on the outlet of the generator. At the same time, nitrogen is added with overpressure into the foam generator. The nitrogen expands when it exits the generator. This creates a robust high expansion foam. The high expansion foam bubbles are filled with > 99% nitrogen.

Single foam generator systems

In practice, one Anoxia foam generator creates a volume of up to 750 liter of high expansion foam per minute. This volume is more than sufficient to fill a wheelie-bin container within 30 seconds. The most common container volumes are:


  • M size – 240 liter;
  • L size – 340 liter;
  • XL size – 370 liter

The choice of the volume of the container depends of the size of the animal and/or the number of animals that need to be stunned/killed. A lid with a chiffon seals the container. As soon as the foam exits the chiffon, the gas supply is stopped and the chiffon is closed. The nitrogen gas concentration in the container remains at 99%.


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Dossier Piglets: German TV Report creats pressure regarding killing piglets on farms

Killing piglets on the farm remains a hot issue in Europe, demanding new methods. On January 12, 2016, the program of ARD Report (German National TV) broadcasted second program on the current method of killing piglets on the farm.

This program was the follow-up of the first Report program, published in June 2015, showing the embarrassed German Agricultural Minister. He explained that after the first Report program, the German politic forced the responsible German veterinary authorities to develop new techniques to introduce new methods that prevent unnecessary stress or pain during the stunning and killing , but according to this new footage, nothing has changed: the animals are still stunned by brute force and there is no control if the piglets are stunned before their throats are cut.

To change this situation, a team of specialists of the Friedrich Loeffler Institute in Celle/Germany, AVT Applied Veterinary Technologies – Innovation & Services (Germany) and Anoxia Europe (Holland) are working on legalizing the Anoxia method for this purpose.

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Why is animal cruelty in February 2014 still front-page news in South Korea?

Unbelievable but true: South Korea still thinks that there’s no other solution than dispose infected poultry by dumping them in deep holes and burry the chickens alive without stunning or culling them first. Yesterday it was in the Korean news that Korea still uses the method of mass burial of chickens. Despite that this is absolutely unnecessary. 10 years ago, I started to develop the Anoxia method, a culling method that is cheap and 100% effective, without unnecessary human intervention and without any unnecessary stress or pain for the animal. The technique has been tested and approved and is today the most welfare friendly culling technique available. It is since 2013 on the market and commercially available.

See the following clip:

See the article published in 2011:

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Korea discovers first CSF outbreak in four years

Pig Progress Dec 2, 2013. South Korea’s first outbreak of Classical Swine Fever (CSF) in four years has led to the culling of a herd of 300 pigs, reports the Organization of Animal Health (OIE). The previous outbreak dated from April 2009, the OIE states. This time the outbreak was confirmed at a rearing farm in Siran-dong, in the province Gyeongsangnam-do, on the south coast of the Korean peninsula. The infection was discovered on November 27 – one day later the OIE was informed. In total, four out of 300 pigs were found infected and as a result, all pigs were destroyed.The location of the outbreak can be seen on the interactive map included in the OIE report.

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Sterksel onderzoekt stikstofgasschuim

Woensdag 2 januari 2013, Nieuwe oogst:

Varkens Innovatie Centrum Sterksel gaat het gebruik van stikstofgasschuim voor euthanasie van zieke of gewonde dieren onderzoeken.

Stikstofgasschuim lijkt de meest humane methode. De dieren raken zeer snel verdoofd door een overmaat aan stikstof. Ze sterven vervolgens binnen korte tijd zonder dat ze uit de verdoving ontwaken, zegt ontwikkelaar N2GF.

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Sterksel onderzoekt stikstofgasschuim

2 januari 2013 publicatie in Varkens – vakinformatie voor de varkenshouderij

Varkens Innovatie Centrum Sterksel gaat het gebruik van stikstofgasschuim voor euthanasie onderzoeken. Bij deze methode raken de dieren volgens ontwikkelaar N2GF snel verdoofd door een overmaat aan stikstof. Ze sterven vervolgens binnen korte tijd, zonder dat ze uit de verdoving ontwaken.

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