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Giving Grasslands a Rest.
Grasslands need time to rest when cattle and other animals feed on them.
Experts say rotational grazing is good for the land and the animals, and it can save money.
This form of grazing can reduce the need for pesticide treatments by reducing the growth of weeds. And it can limit the need for chemical fertilizers by letting animal waste do the job of natural fertilizer.
Intensively used grasslands are also harmed as the soil is continually crushed under the weight of heavy animals. And the animals usually avoid their own waste, so that reduces the amount of good grazing space even more. Experts say that while rotational grazing can save money over time, it also requires planning.

http://www.voanews.com/specialenglish/2010-01-19-voa1.cfm

impression
I have not brought up an animal and a plant in a farmhouse, but hear it when I am very serious, and there is the fact in a disaster and the difficult time.
But I think that oneself wants to experience it.