I feel all animals should be stunned, but if animal welfare is a great concern then one should consider veganisum. From what I read, the cruelty in dairy is every bit as bad as the meat industry.
Though I agree with your position in principle, placating one's own conscience does not prevent the ongoing cruelty. If we all became vegetarian overnight it would result in every farm animal being killed and left to rot, the countryside predominately used for meat would, over a very short period, become unrecognisable, and that land used for food production would rely increasingly on fossil fuel fertiliser. The reality is we are an omnivorous species and eating meat is a staple of our diet but that does not mean we can treat that food sauce with scant regard to welfare.
The sad thing is that if the law of the land was adhered to we would be debating more contemporary topics such as " should our next prime minister be transgender" ?