What makes prairies suitable for cattle rearing?

Answer 1

The prairie is a grassland habitat that can only thrive if it is experience grazing pressure from any kind of herbivorous grazer, whether it's from the historical large herds of bison or the present-day large herds range cows. It cannot survive without grazing because of the impacts created on such a natural grassland by the introduction and destruction of invasive plant species--such species push out native plants and decrease overall quality of the rangeland. Such is what has happened when no grazing was allowed for several decades in the Grassland National Park of Saskatchewan, Canada.

Cattle are, just like the old American Bison, herbivorous grazers, suited for grazing open tracts of grassland--native or tame, marginal or not--under the watchful eye of the people that care for and manage their movements across the landscape: the rancher and the cowboy. The prairies offer such extensive fodder for these animals to consume, live off of and thrive off of that make it highly suitable for these domesticated animals to be raised on. Not only does the rancher benefit from such land because of the ideal fodder available, but it also benefits the prairies because they are recieving the very natural pressure put on by the animals it was adapted to rely on. It completes the whole ecological cycle by having such grazers there, such that it becomes and maintains its health the same way it had before the great bison herds were exterminated.