When raising stock on small parcels, the usual concerns are nutrition, sanitation and medical intervention.
A natural system is a direct replacement of all of those concerns. Grazing livestock evolved to eat plants that grow in the ground. From what I have seen where I have been in nature in America, wherever I go, there are suitable conditions for livestock to thrive off of nature.
The only problem is that in the domestication of nature, the natural processes have broken down and the ecosystem that has been domesticated is in a state of natural decline. Only by imitating the natural processes which in times gone by were the lungs of a verdant ecosystem will man kind be able to stop desertification, erosion and topsoil loss from destroying the planet.
What is amazing about this is that this process will "kill nine birds with one stone" in that it will heal the land and the water of the earth, the animals themselves that are implemented in the grazing will be healed and their genetics steadily improved, the humans who eat the animals will be healthier and the air we breath will be healthier because the earthworms and bacteria will crowd out the molds and mycotoxins that now pollute the soil and in general more natural animals, birds, wild game and even sea life will be able to thrive once again.
Allan Savory said there is more examples of collaboration than competition. Herds of horses, donkeys, cows, pigs, sheep, goats and all manner of stock can be kept together in vast herds on the range or pasture if the natural laws are followed. They will in fact benefit from each other's presence and generally are able to eat more of their favorite food and have more freedom of the field. They in fact appear to be happier together than they are as one species!
There is one simple rule that can be applied to the care of these beasts that goes before all rules in the apex of a civilized society. As Gerald Fry said "Quit fiddling with all that junk, just keep them on good grass and excellent health will manifest itself".
Even if the grass is not good, feed the soil before planting "improved varieties". Feed the soil with animals. The soil misses the animals. Keep them on fresh, mature grass and the land will abide by the animals.
Though you also have to have the right animals. Not saying it's easy!
Dinner will be steamed monkey heads with a side of tiny ads.