Varies from year to year here and based on what you include...
Native Grazing - November to January/February - $0.33 per day (includes land rent), $0.065 mineral (regular - not breeding), labour (15 minutes per day if no snow to pump water, 15 minutes per week with snow cover)
Swath grazing - January - March - $0.175 per day (includes seed, labour, equipment depreciation, fuel, cutting, etc), $0.065 mineral, 15 - 30 minutes per week labour
Hay/Straw feeding - March/April - $1.25 (includes labour, machinery - varies by crop per year), $0.065 mineral. We try to keep this under 45 days, and usually hit around 30.