The aim of this manual is to provide guidance and tools to countries in developing National Feed Assessments (NFAs), based on lessons learned from current approaches across a wide range of feed situations. Global and country-level feed situations are reviewed to highlight the need for quantitative assessments of livestock feeds in both developed and developing countries. Broad guidelines for the development of NFAs are provided, followed by detailed case studies and descriptions of methodologies that have been implemented in a variety of countries worldwide.