Fescue/orchardgrass is an excellent combination with Johnsongrass. The Fescue/Orchardgrass is cool season and you can take a cutting of hay off that before the Johnsongrass comes on. Then, you can take 2-3 cuttings of Johnsongrass. If you pasture it, you dont want to leave enough cattle in the pasture to eat it into the ground all summer, they will kill it out. The easiest way to sow Johnsongrass is to cut it after it has matured and went to seed and then bale it and feed by unrolling the bales. The seed will start an excellent stand. If you have some Johnsongrass, you can lightly disk it and it will scatter the roots and create a better stand. As a new cattle farmer once asked "I have Johnsongrass in my field, what do I do? The reply by the veteran farmer was "Fertilize it heavy". It has also been correctly pointed out that Johnsongrass is very costly to crop farmers.