David Dimbleby is to miss chairing BBC One's Question Time for the first time in more than 15 years after being injured in a "minor farming accident".
The 71-year-old was loading a bullock onto a trailer at his farm in Sussex when it reared, resulting in the presenter being briefly knocked out.
He also received a cut to the head that required stitches at a local hospital.
John Humphrys will replace Dimbleby in the chair on Thursday, while he remains in hospital for observation.
"I haven't missed a Question Time in over 15 years," Dimbleby said.
"Trust my wife's bullock to take me out. I'll be giving bullocks a wide berth in future," he added.