best way to supplement hay for both protein and energy?

Cows are being fed round bales grass hay and 5lbs per day of a 12% steer finisher. Cows need to put on some weight/condition. Thinking of adding 20% Easyblox compressed block tub. Of course, wanting to do this as cheap as possible. We are located in Michigan.

Thanks for your advise.

DLZ

Have you had your hay tested?  If not,  it would be a good idea to do so before adding anything else to the reation.  Also, you don't say if your cows have calves at side or not.  The best time to put weight on cows is before they calve.  If your cows aren't lactating then a ration of good qualitry hay and the steer feed you are using should get them gaining weight.