1) Advantage of having a source of replenishing food: milk, meat. Ruminants also provide power for cultivation and other farming needs and their manure is a valuable source of fertilizer.
2) The use of ruminants allowed travel in past and helped in agriculture as force to plow the land.
3) Source of live material: blood, plasma, cells, tissues for scientific study
4) Humans don`t need to waste time hunting for wild animals and surviving. So, more time they could devote to physical and intellectual expansion
5) Ruminants consume organic wastes, recycling it, like citrus pulp, sugar beet pulp, almond hulls and many similar products.
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