Grass-fed producers: COGS, time to market, finishing greens

[hueyrescue]

For those of you who run grass-fed operations, what do you find is an average cost of goods sold per pound (leaving out any labor costs)?

Also, what is the typically market cycle (in days) from birth/purchase to finish to slaughter for your grass operation?

Finally, what do you use to finish? I've read several strategies in Stockman's- legumes, leaf corn, brassicas- what are most of you using?

Thanks!