A logical approach to agriculture is to integrate crop production with livestock, or at least to use systems of agriculture which do not require the consumption of large quantities of fossil fuel. To investigate which systems are most appropriate it is necessary to look at various regions of the world, and particularly at different climatic zones. Systems which are applicable in one area are not necessarily applicable elsewhere. This paper considers three of these situations; dry land (rainfall 500 mm or less), savannah (500 to 1000 mm) and high density/high rainfall (over 1000 mm) or irrigated cropping areas, and deals with the special cases of scavenging poultry and draught animals.
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