Well, what Salatin does, and what we do, is that the animals fertilize the pasture, so there is no transportation involved. Salatin talks about cutting hay from the field where the cows, broiler chickens, and layer hens rotate. We move our sheep across our hayfield with portable fencing.
If you like to read, also add Michael Pollan's books: The Omnivore's Dilemma and In Defense of Food. They're written for consumers, but he talks about how it became a problem when animals left the farm. Now we have lagoons of animal waste on the cattle and pig farms; but down the road, they're spraying petrochemical fertilizers on fields because they have no natural fertilizers. Farms need to have both plants and animals, because it's a symbiotic relationship: the animals fertilize the grass, the grass feeds the animals, the animals fertilize the grass, and so on. There are people who put pigs in their garden over the winter, so the pigs fertilize the garden and till it. There are all sorts of ideas, but basically it's figuring out how to make a natural system work in your area.
Trying to have an organic operation in a conventional environment is expensive. If you get all the components of an organic operation in place, it will cost you less. If you get a chance, see the documentaries that came out this summer: Fresh is one, and Food, Inc, is the other. They both interview Salatin, as well as other organic, sustainable producers, and they're making a lot of money selling premium products with less overhead than conventional ranchers. I think those films are supposed to be coming out on video soon, so you should be able to get them from Netflix.
it seems odd to me that rotational grazing seem like a new or revolutionary concept to anybody... in new mexico thats all there is. its simply to dry to do it any other way. yet green enough to support cattle and sheep opperations.... the problem with true organic farming on a farm like ours is the cost involved. there are litterally heeps of manure avalible within 30 miles but to transport the ammount of manure it would take to fertalize our cropland would cost more than what is really feezable....there was some guy making compost out of it here a few years back but i dont know what happened to him... thats kinda seems like the ticket in my oppinion cause you get the quality without having so much tonage involved in transport...