Cattle are strange

I am feeding my heifers about 2 pounds of corn, all the good grass hay they will clean up, and 3 or 4 pounds of alfalfa.  So this morning I had fed and all the heifers were lined up with heads in the feed bunk.  Neighbor's hired man had fed the fall pairs so they were out west in the field and busy eating.  I figured it was a good time to get into the hay yard without being disturbed.  In the back corner of the hay yard there is 12-15 3x3x6 mid size square bales.  I inherited them from the previous owner.  They have to be at least 4 years old.  Maybe older.  So I very carefully get one to put into the shed for bedding.  I manage to get it to the shed before it falls apart.  I start spreading it around.  8 heifers quit their good grass and alfalfa to come eat on this old mostly rotten hay.  Well I guess they will do a better job of spreading it around than I did.