In Iowa sudangrass is an outstanding temporary pasture crop during the summer months of July, August and September. It can also be used for emergency hay or silage. Here are some tips on varieties and management.
Kalton, R. R. and Thompson, H. E.
"Sudangrass in Iowa,"
Iowa Farm Science: Vol. 11
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol11/iss9/4