That information comes form local farmers, I don't know if it was based on any real data maybe more on feeling and personal observation, we are strong on timothy grass so maybe conditioning it removed lots of seed from it, but we see some farmers removing the conditioner on their cutter and some re installing it when they buy a used one that has been removed or some hating it and some loving it...I am just trying to get a better understanding of it. So longer it dry or take to dry less nutriments there is in it? I know if you conditioning it, it puts the hay in a row, so one as to rotate it or tedding it within a shorter window in order to dry the bottom of the row. For legume grass more you rake it more seeds you loose so less nutriment you get so there is that also. When cutting without a conditioner it is equally distributed on the ground so you can leave it there for longer since it is drying equally. May be it has to do more on the type of grass whether it is better without vs with

... I also heard that conditioning it squeeze some ''juice'' (water that contained nutriments) out of the hay which would remove some nutriments compared to without one the water evaporate leaving more nutriments in it.... is it true I have no clue.