So, while the suffering of cows, pigs, sheep, chickens, and other food animals might not be the same as ours or the same across species, this is not at all surprising and does not mean that they do not suffer in their own ways. Indeed, all mammals share the same neural apparatus and neural chemicals that underlie their emotional lives, so let's stop pretending that their suffering isn't as real for them as ours is for us. We accept that prelinguistic humans suffer, so not being able to say that this or that causes pain isn't enough to conclude that we don't know that other animals really suffer. They tell us they suffer physically and emotionally in many different ways, and anyone who's been around other animals knows this.
We also need to stop pretending that we don't know what other animals want and need. Of course we do - they want to live in peace and safety just like we do. And, many scientists agree, and the number is growing, that consciousness and sentience are widespread in the animal kingdom, more so than previously thought, so it's not rocket science to conclude that other animals experience what we do in their own ways (please see "Scientists Finally Conclude Nonhuman Animals Are Conscious Beings" and "A Universal Declaration on Animal Sentience: No Pretending." And, of course, there are also individual differences among members of the same species, just as there are among humans. These individual differences in personality are incredibly fascinating and challenging to understand in nonhumans and humans. So, while cows may suffer differently from pigs, for example, individual cows likely suffer differently as well.