The answer depends on how we view animals and humans. There are three conflicting contemporary views. By that argument, animal experiments are just as offensive as racism or sexism. It is purely cruel treatment driven by prejudice. The opposing view is that humans own animals, which are intrinsically inferior.
Animals have value because they are useful to humans.
There are no limits to what humans can do to animals in the interests of human welfare or profit. You could argue that anyone who is prepared to allow the destruction of animals by industrial pollution as well as some of the 'Factory Farming' practices of modern agriculture, also holds this view. A third view derives from the Christian perspective. This holds that despite many biological similarities between humans and animals, humans are uniquely and supremely valuable. Many people find that there are clear distinctions between humans and animals, for example being able to appreciate beauty and having a conscience about what is right and wrong.