In Genesis man gets dominion. In Proverbs 12/10 we read:
A righteous man has regard for the life of his animal, But even the compassion of the wicked is cruel.
So a duty is laid upon the husbandryman to be humane and effective in the care and training of his animals. By extension, you can argue that this encourages conservation efforts, also.
Or if you want to be Darwinian we are, in fact, at the top of the food chain. But, if by our actions, we destroy that chain what happens to those at the top? We might be the last to die, but death is sure.