Field-cured hay often is rain-damaged-increasing field losses and cutting protein and carotene content. You may want to use improved harvesting methods to reduce such losses. If so, here are the alternatives and what to consider.
Bivens, Gordon E.; Beneke, Raymond R.; and Barger, Gerald L.
"Field Cure, Barn Cure or Make Silage?,"
Iowa Farm Science: Vol. 7
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol7/iss12/6