When we got to the barn, a big "Claw" gizmo would come down from the peak of the roof of the three story barn and hook the loose hay off the wagon and take it Up and drop it in the barn.
Later in the fall, or maybe winter, Us kids would like to go into the barn and climb up HIGH inside the post and beam barn... and Jump down into the loose hay sometimes three storys below. The farmer didn't like us to do that and told us...IF we DID that..the cows would smell our human scent on the hay and wouldn't eat it.
After I grew up I figured the farmer was just concerned that when we landed in the hay.. we might land Wrong and be injured.
NB
PS: In those days (Late 40s...) a Law Suit for injurys was not a big priority in most peoples minds.