(Side note: that fermented hay is called Silage and fun fact it’s one of the single foulest smelling substances produced by humanity. Smells more like raw sewage than actual raw sewage, and frequently triggers asthma attacks. Cows, inexplicably, go absolutely ape for it. A silage farm near where I grew up had frequent breakins from nearby pastured cows who had figured out the latches so they could sneak in.)