Theoretically, finer particle will be easier to digest in the rumen, however the presence of coarse particle might increase the amount of starch into small intestine thus increasing energetic efficiency.[20] Livestock could be fed by grazing on grasslands, integrated or non-integrated with crops production. Livestock that are grown in stalls or feedlots are landless and typically fed by processed feed containing veterinary drugs, growth hormones, feed additives, or nutraceuticals to improve production effectiveness.[21] Similarly, livestock are consuming grains as the main feed or as additional nutrient to the forage based feed. Processing grains for feed is aimed to get the easiest digestible grains to maximize starch availability, thus increasing the energy supply.