In Animal Farm, what is the symbolism of the knacker?the knacker was affiliated with Boxer's death but i dont know what the knacker symbolized.

When Old Major delivered his speech which contained the idea for the animal revolution, one of the things he forecast was that, if human rule continued, Boxer would be sold to the knacker “the very day that those great muscles ... lose their power.” The irony is that the pigs, who were supposed to be better and kinder leaders of the animals had now done the same thing Old Major predicted the humans would do. This exemplifies the idea that the pigs have now become just as brutal and uncaring as the humans whom the pig replaced. The pigs now symbolize repression and greed just as the human had once symbolized the same characteristics.