Undercover footage has revealed “systemic” violence being inflicted on boars at a Norfolk farm linked to those supplying pork and ham to UK supermarkets – including some boasting high-welfare labels.

Since our initial efforts for better influenza control seven years ago, we have made significant progress in weaning more negative pigs to shareholders.

While not a fatal disease, the infection is painful, affects growth and meat production, and often leads to injudicious use ...