Abstract
The evaluation of dairy production systems have been made mainly from farm economy only. This attitude have caused various environmental problems such as lowering self-sufficiency rate and high input fossil energy in dairy farming area.
In this paper three indexes; economic efficiency, fossil energy input and nitrogen surplus were applied to evaluate dairy production systems totally with considering sustainability.
Investigation object area is A-district (197 farms) in East Hokkaido Japan.
As a result, it became possible to evaluate fossil energy input per unit milk production [kg] (6.0[MJ/kg]) and nitrogen surplus per unit operating area [ha] (106[kg-N/ha]) by using multiple evaluation indexes. It was also found by multiple evaluation that farms having high evaluation in economy could not always have high evaluation in energy and environment.
These results insist that multiple evaluation indexes other than economy should be used when dairy farming systems are evaluated.
