Dairy nutritionist Henry Holdorf, Purina Animal Nutrition, says this year, corn silage is variable due to when you planted your corn. He is noticing lower fiber digestibility, specifically neutral detergent fiber (NDF) digestibility. NDF digestibility is important because it can help determine how well a cow can use feed material, which can positively impact milk production. He advises mixing alternative feed ingredients into the ration or even raising the cutting height as you harvest corn silage.