Some things are done for cosmetic reason and can cause long lasting side effects - like cat declawing for example so that is certainly understandable why it was banned. As far as production animals go - yes there is some things like branding, castration and other procedures done which are for their intended purpose - meat of non castrated boar or bull will taste poorly compared to castrated one for example. But I understand what you mean, that line is pretty unclear even to me... if PETA would get their way no animals would be every used for any human purposes, including horse raiding as obviously horses do not consent for humans to use them for their own sports or pleasure. At the end of the day my point was that if we banned cosmetic and unnecessary surgeries for cats and dogs long time ago then why are we still doing it on infants who can't give a consent? Circumcision at the end of the day is just a cosmetic surgery as well.