Four years of research at the Experiment Station show that the dough stage is the best time to harvest oats for silage. Oats cut then produced more tons of silage, had a good aroma, and the cows liked it best.
Gardner, F. P. and Allen, R. S.
"Dough Stage Best for Oat Silage,"
Iowa Farm Science: Vol. 15
, Article 2.
Available at: http://lib.dr.iastate.edu/farmscience/vol15/iss12/2