A farmer rides on a truck tyre as he trains his two young oxen to pull at a farm on the outskirts of Havana August 4, 2011. Cuban President Raul Castro has pushed for a new economic and social model based on individual effort and reward with targeted welfare, to replace one based on collective labor and consumption. The number of small farmers has increased by 150,000 since the state began leasing small plots of fallow state lands three years ago in hopes of reversing an agricultural crisis that has the country importing 60 percent to 70 percent of its food. REUTERS/Desmond Boylan (CUBA - Tags: SOCIETY POLITICS IMAGES OF THE DAY ANIMALS AGRICULTURE)