[EN] This paper presents a methodological proposal of new energy sustainability indicators
according to a novel accounting that follows agroecological and ecological economics criteria. Energy
output is reformulated to include manure and thus consider the contribution to fertilization made
by pastoral livestock farming to agroecosystems. Energy inputs calculations include the grazing
resources. These new definitions and calculations allow for new formulations of the energy return
on investment (EROI) as measures of the energy efficiency of livestock farming systems (final
EROI and food/feed EROI). The environmental benefit of manure is estimated from the avoided
energy cost of using this alternative to inorganic fertilizers (AECM). The environmental benefit of
grazing is measured through the energy cost of avoiding cultivated animal feed (AECP) and its
impact in terms of non-utilized agricultural area (ALCP). The comparative analysis of different
livestock breeding systems in three pastoral dairy goat farms in the Sierra de Cádiz in Andalusia,
southern Spain, reveals the analytical potential of the new energy sustainability indicators proposed,
as well as the potential environmental benefits derived from territorial-based stockbreeding and,
more specifically, grazing activities. Those benefits include gains in energy efficiency, a reduction of
the dependence on non-renewable energy, and environmental costs avoided in terms of energy in
extensive pastoral systems.S
