Final answer:
The pigs formulate the teachings of Old Major into a system of thought called Animalism.
Step-by-step explanation:
The pigs formulate the teachings of Old Major into a system of thought called Animalism. Animalism is an ideology that promotes the equality of all animals and advocates for the overthrow of human oppression. It is the guiding principle of the rebellion on the farm in George Orwell's novel 'Animal Farm'.