The number of animals which can be brought into existence probably being limited, or the number destined to inhabit our globe probably being so; it a… - Lewis Gompertz

I admit it as an axiom, that every animal has more right to the use of its own body than others have to use it.

The slaying of animals for the most trifling purposes is defended on the ground, that if not done, they would be too numerous, and consequently troublesome to man, and unhappy in themselves; while the promotion of their increase is defended on the assumption, that we are then the authors of much happiness. But let us apply a cautious ear to such reasoning. If the promoting the increase of animals is being the author of increased happiness, destroying them must be positive evil. For our own parts, we prefer neutrality as much as possible on these points, because we know not whether the life of animals generally, abound most with pleasure or pain. We confess that in our view of the question, pain seems to predominate; and the more so the more the numbers of animals are increased; indeed, we neither approve the promoting of the increase of animals, nor of destroying them.

Axiom 5. That we should never admit of the propriety of the will or volition of one animal being the agent of another, unless we should perceive its own good to result from it, or that justice should require it.