Mark Thomas has spent 30-plus years in the grass seed industry, and today he ranches south of Enid, Oklahoma with his wife Annette — raising 100% grass-fed beef on a system built around diverse annual and perennial forages. In this conversation, Keith and Mark dig into some of the most practical questions in regenerative grazing: How do you integrate perennials with annuals? When does it make sense to convert crop ground to grass? And what's actually happening in the rumen when cattle graze a diverse mix versus a monoculture?