Last couple of years the Livestock Policy Initiative of IGAD (IGAD-LPI) in cooperation with the Ministry of Finance and Economic Development of Ethiopia (MoFED), has revisited estimates of livestock’s contribution to the Ethiopian economy, through three studies, which conclude that the contribution of livestock in the Ethiopian Gross Domestic Product (GDP) and to the wider economy is much higher than previous estimates.
The whole post and study reports are available from the IGAD-LPI blog
Systemwide Livestock Programme 