If you find yourself reading the title of this [article] twice, wondering what “space” has to do with the diet of a dairy cow, you are not alone. Nutritionists and producers regularly discuss terms like pounds of dry matter intake (DMI) or percent protein or how many megacalories of energy or grams of calcium or what is the ratio of calcium-to-phosphorus. None of these discussions even comes close to mentioning space as an important consideration when planning or troubleshooting a milking cow’s diet.