“Gas and brakes.” Have you ever imagined, as you are feeding forage to your dairy cattle, that you are pressing a “gas pedal” or a “brake pedal”? Kurt Cotanch, “the lab guy” at the Miner Institute in Chazy, New York, likes to metaphorically compare the fast pool of fermentable fiber to the gas pedal, speeding up passage through the rumen, and the pool of slow and indigestible fiber as the brakes.”