'Animal welfare' is the desire to prevent unnecessary animal suffering (that is, whilst not categorically opposed to the use of animals, wanting to ensure a good quality of life and humane death)

Source: www.worldanimal.net

The European Commission has defined the so-called "Five Freedoms" to define ideal states of animal welfare:

1) Freedom from hunger and thirst - access to fresh water and a diet for full health and vigour;

2) Freedom from discomfort – an appropriate environment with shelter and comfortable rest areas;

3) Freedom from pain, injury and disease – prevention or rapid treatment;

4) Freedom to express normal behaviour – adequate space and facilities, company of the animal’s own kind;

5) Freedom from fear and distress – conditions and treatment which avoid mental suffering

Source: European Commission