Our inventory supposed that 100% of the high-quality
feed and 50% of the low-quality feed ingredients were
imported. The recently published official figures for
Vietnam, however, were 90% and 40% to 50%, respectively.
Using these figures in the calculations would slightly reduce
the impacts from global transport, but increase the impacts
within Vietnam.
Most of the inventory data for feed ingredient production
came from EcoInvent®2.0. Insufficient time and means
were available for us to check their reliability. However,
other LCA studies have also shown that feed production
dominates most of the impact categories (Papatryphon et al.
2004; Mungkung 2005; Aubin et al. 2009; Ayer and
Tyedmers 2009). Those studies thus support our main
findings. In common with most other studies, our screening