no+complaint+was+made+about+that+either.

I think this is quite significant since eventhough pigs were not giving equal rights to all the animals, the animals do not complain about that. In other words, animals are not rebelling or questioning the ruler. Like in animal farm, in Russia Revolution, Stalin was a ruler who wanted the Utopian society. However, he is not giving equal rights. At first the people in Russia did not question his rule because the people thought he was quite superior!