More: Can we justify killing animals for food? - BBC News (26. October 2015)"If a cow is killed that will make it possible for another cow to come into existence who will have a good life, and if the first cow were not killed it would not be possible for the other cow to come into existence.
"So yes, this cow standing in front of us will lose the rest of her life, but that loss is replaced by bringing the other cow into existence and the other cow will also have that happy life.
This is from a BBC Radio 4 programme called Analysis. The whole programme is available from here (UK only, I think):
BBC Radio 4 - Analysis, Killing Cows
I think some of Peter Singer's thinking in this article is somewhat flawed. If we follow this line of thinking, it sounds like we could be doing moral good simply by "creating" more and more cows. Or humans. Maybe this is how the Duggars think?
I mostly agree with the other three philosophers here, I think.