Ministry of Agriculture and Rural Development

This Collaborative Research Report is circulated prior to full peer review to stimulate discussion and comment. Based on that process, its content may be revised ii Acknowledgements Gratitude is expressed to all farmers who participated and contributed to this study. Thanks go the Ministry of Agriculture and Rural Development, KARI and ILRI staff who were tirelessly involved in carrying out and supervising the surveys. This publication is an output from a research project funded by the United Kingdom Department for International Development (DFID) for the benefit of developing countries. The views expressed here are not necessarily those of DFI