Sciencemag.org: Smart Investments in Sustainable Food Production: Revisiting Mixed Crop-Livestock Systems

Farmers in mixed crop-livestock systems produce about half of the world’s food. In small holdings around the world, livestock are reared mostly on grass, browse, and nonfood biomass from maize, millet, rice, and sorghum crops and in their turn supply manure and traction for future crops. Animals act as insurance against hard times and supply farmers with a source of regular income from sales of milk, eggs, and other products.

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Source: http://www.sciencemag.org/cgi/content/full/327/596

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