A simulation model of the dairy forage system (DAFOSYM) was used to st
udy the long-term performance and economics of direct-cut alfalfa harv
est and storage, with a treatment such as formic acid, to enhance pres
ervation. Compared to a wilted silage system, total losses were not re
duced substantially with the direct-cut system in Michigan. Handling o
f the wetter material increased machinery, fuel, and labor costs for t
ransport and feeding. Even with no added cost for forage treatment and
effluent handling, the direct-cut system was not economical. Direct-c
ut harvest with a treatment like formic acid was more economical than
wilted silage only if a 3% increase in animal intake and milk producti
on was attained - a scenario not supported through fee&ng trials. Deve
lopment of a system for direct-cut harvest and preservation of alfalfa
for the midwestern and northeastern U. S. appears infeasible consider
ing known technology.