One day people will begin to wake up about sourcing hay! Hay species has very little to do with palatability, nutrition, quality, value, etc. Johnsongrass makes good hay cut and put up approiatlely, Alfalfa can get so woody that you cannot get much of anything to eat it well. People come in the barn all the time and ask for timothy and go to the woodiest, long stem, rank, 6" long timothy heads and say this is timothy, right?" Yep! That is what I want." Probalbly has a crude protein of 4% right in line with the cardboard baled behind wallmart.
You don't buy feed based on its species, ie. Oats, corn, vegtable products, etc. You now buy a feed with 12% protein and 4% fat conteint. You can buy your hay the same way.
Ask for the rfv on any hay you purchase.
Less than 75 = lot of waste, no nutrition, may lead to impaction colic
75-86 = gelding chewing hay during the winter - can eat all they want and not founder - not for performance horses
87-102 = nicer hay, general medium quality hay - will keep an animal in decent condition by itself with no grain if not working.
103-124 = either a very nice grass hay or an alfalfa mix - the kind of hay you want to buy
125-151 = performance horse quality for a mostly hay diet - can put weight on a horse with this kind of hay - will have very little waste if any
151+ = barrel racers, race horses, feed for really putting weight on or broodmares - can founder idle horses with this hay easily