A presentation prepared by Theib Oweis and Don Peden for the Livestock & Global Climate Change Conference, Hammamet, Tunisia, May 17-20, 2008.

4. Non-productive depletion Transpiration Water Conserving strategies Feed Sourcing strategies Rain Surface inflow Available animal feed Drinking Evapo-ration GW recharge Benefits from plants Trees Pasture Imported feed Productivity- enhancing strategies Animal benefits Meat, milk, hide, manure, power & wealth Discharge & flood Quality loss Feed crops Grain Residues Food crops

6. Field water balance: real & paper losses Storage Irrigation Precipitation Runoff recoverable Transpiration Evaporation Losses To ground water recoverable Deep percolation Drainage Partially recoverable Quality losses Seepage recoverable

11. Tradeoffs between water and land productivity Max WP Max Yield

20. Thank you