McDonald's won't use T&S Farms any more after an activist group, Mercy for Animals, went to the web with a video, showing ill, maltreated chickens at the plant being slaughtered brutally. The farm is contracted to chicken giant Tyson Foods, which supplies chicken to McDonald’s, the second biggest purchaser of poultry in the USA. Tyson said the company was investigating, but is also terminating the farmer’s contract, based on what it has seen.