A system for keeping livestock in which the animals are allowed to run free over a field or an area of land. For poultry it means the birds have free access to an outside area during daytime but are usually housed at night. (RAMIRAN Glossary of terms on livestock and manure management 2011)
The measure of the total domestic and foreign output claimed by residents of an economy, less the domestic output claimed by nonresidents. (World Bank, 2005)
