Corn silage is a high-quality forage crop that is used on many dairy farms and on some beef cattle farms. Its popularity is due to the high yield of a very digestible, high-energy crop, and the ease of adapting it to mechanized harvesting and feeding. The importance of silage additive. The forage you grow is the most cost effective source you can provide your cows. A fast fermentation is the key to optimising the quality of your silage. The faster your silage ferments, the more essential nutrients will be retained.