As a counterpoint I recently saw an astonishing-if-true stat of the number of animals killed per million calories by food [1]. About 14x as many chickens die vs pigs. Even if pigs are smarter, that may change the way you weight the ethics a bit.
We should all be eating brainless bivalves perhaps? [2]
We should all be eating brainless bivalves perhaps? [2]
[1]: http://www.animalvisuals.org/projects/data/1mc
[2]: https://sentientist.org/2013/05/20/the-ethical-case-for-eati...