What are key rhetorical devices or techniques used by Old Major in his speech?

I think
that one of the most critical rhetorical devices thatuses is the connection with his audience. 
Old Major specifically speaks to the animals in a manner that makes relevant his ideas. For
example, he specifically refers tobeing taken to the Knacker's.  This is something that is a
fear for animals like Boxer, and in doing so, Old Major is able to directly connect what he is
saying to the audience listening.  Another rhetorical device is that Old Major offers a contrast
between what is and what can be.  This parallel provides a sense of hope to the animals, and
allows for a sense of inspiration to be present.  Old Major's inspirational quality is something
that enables him to be able to reach the animals in a way that allows them to see what can be. 
This is seen particularly in the pigs, who sit in the front and pay attention to what is being
said.  Old Major's stress about his own age is another rhetorical device that helps to bring out
his ideas to the audience.  His fundamental argument is that none of what he says is for his
benefit, as he is going to be moving on soon enough.  Rather, he speaks for the animals and
those who will come after him.  In this, he is able to provide another connection of meaning to
his audience.