What is Old Major's grievances against humans?

Over his lifetime, he has come to the conclusions that “No animal in England is free” and “The life of an animal is misery and slavery” (28). Old Major states that animals’ domination by Man is the sole reason they cannot be free, happy, and fulfilled. Man is “the only creature that consumes without producing.” His only job is to be “lord of all the animals,” which makes him “the only real enemy” animals have. Man overworks animals only to rob them of the fruits of their labor, and treats them only well enough to survive and provide more labor. When Man is done with an animal, he slaughters it cruelly.