Andrew Knight videos

How Much Do Chickens Suffer When Gassed With CO2 03:39

How Much Do Chickens Suffer When Gassed With CO2

How Much Does Animal Farming Contribute to Climate Change 04:16

How Much Does Animal Farming Contribute to Climate Change

Consumer Acceptance of Sustainable Dog Food 03:36

Consumer Acceptance of Sustainable Dog Food

Consumer Acceptance of Sustainable Cat Food 03:41

Consumer Acceptance of Sustainable Cat Food

Meat Based Versus Vegan Pet Food: Environmental Sustainability 04:19

Meat Based Versus Vegan Pet Food: Environmental Sustainability

How Should Pigs be Stunned at Slaughter? 04:26

How Should Pigs be Stunned at Slaughter?

How Much do Vegan Diets Improve the Health of Dogs? 06:18

How Much do Vegan Diets Improve the Health of Dogs?

Fox Control Methods Animal Welfare and Ethical Implications 04:45

Fox Control Methods Animal Welfare and Ethical Implications

Should Tigers Be Used Within Travelling Circuses? 07:48

Should Tigers Be Used Within Travelling Circuses?

The Welfare of Backyard Chickens 04:35

The Welfare of Backyard Chickens

Influenza Risks From Pig and Poultry Farms 04:29

Influenza Risks From Pig and Poultry Farms

Cell Based Seafood: Japanese Consumer Views 04:08

Cell Based Seafood: Japanese Consumer Views

Could Vegan Pet Food Help Save the Planet 05:17

Could Vegan Pet Food Help Save the Planet

Are Vegan Diets Good for Cats 05:05

Are Vegan Diets Good for Cats

Meat Chickens and Colony Cages 04:12

Meat Chickens and Colony Cages

Are Vegan Diets Good for Dogs? 05:47

Are Vegan Diets Good for Dogs?

Should Cats and Dogs go Vegan? - Professor Andrew Knight, University of Winchester 01:05:12

Should Cats and Dogs go Vegan? - Professor Andrew Knight, University of Winchester

Educational Animal Use Within Europe 06:03

Educational Animal Use Within Europe

Pet Food Manufacturing 04:35

Pet Food Manufacturing

Vegan Pets Are Just as Happy with Their Meals 03:44

Vegan Pets Are Just as Happy with Their Meals

Greyhound Racing 03:42

Greyhound Racing

Creating a Clinical Skills Laboratory for teaching surgical and clinical skills 02:58

Creating a Clinical Skills Laboratory for teaching surgical and clinical skills

NZALA Report - inconsistencies between the Codes and the Act 04:26

NZALA Report - inconsistencies between the Codes and the Act

The Green Protein Report 03:38

The Green Protein Report

Wildlife Trade - Confiscated Animals 03:26

Wildlife Trade - Confiscated Animals

Efficacy of Alternatives to Educational Animal Use 05:11

Efficacy of Alternatives to Educational Animal Use

Animal Research and Depression 05:17

Animal Research and Depression

Sow farrowing crates NZ 01:39

Sow farrowing crates NZ

Supermarket Chicken and Pandemics 05:35

Supermarket Chicken and Pandemics

Primate Research 04:44

Primate Research

Animal welfare in New Zealand 04:43

Animal welfare in New Zealand

September 27, 2025

Billions of pigs are slaughtered for food annually, and high concentration CO2 within controlled atmospheric stunning (CAS) systems is one of the most common methods used to stun pigs unconscious at the time of slaughter. However, a high concentration of CO2 is aversive, and creates severe animal welfare problems for pigs. Numerous alternative stunning methods have been proposed, including inert gases, electrical and mechanical methods, low atmospheric pressure stunning, and nitrogen foam. After reviewing studies of the animal welfare impacts associated with these methods, stunning using the inert gas argon created the least severe welfare problems, with the lowest cost increases for the industry. Accordingly, the industry is recommended to switch to argon using the CAS infrastructure already in place. Although the associated welfare impacts of argon remain significant, and are not acceptable from ethical or animal welfare perspectives, they represent a significant improvement on CO2 stunning. Published study: https://www.frontiersin.org/journals/veterinary-science/articles/10.3389/fvets.2025.1542798/full