Bovine TB led to the slaughter of more than 28,000 cows in England last year. It costs the taxpayer £100 million a year and it's the reason for the Government's decision to carry out two controversial pilot culls in Gloucestershire and Somerset. But what is it like to be the one who has to carry out the tests on cattle, and deliver the bad news to the farmer if their animals are found to be infected? For this week's On Your Farm, we look at this disease through a vet's eyes. The South West is one of the worst hit regions in the country for Bovine TB. Sybil Ruscoe visits the South Hams in Devon to follow vet, Richard Walters, on his rounds for the day, as he deals with bovine TB and meets the farmers affected by it.