I feed it to doelings much the same as Vicki does, and then gradually switch over so that by the time they kid, they are eating the same grain the milkers do. This way, there is no milk withdrawal time.
The medicated meat goat pellet is not recommended for lactating does. You aren't suppose to drink the milk if they are eating it. The nutritionist at Producers Coop in Bryan told me this. However it is o.k. to feed to goats that are dam raising their kids. I do mine the same way. I feed it to all the kids until about 30 days before they kid and I start switching them over to grain.