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Humans are not designed to digest grass
Humans can drink cow milk, or yogurt or cheese that has less lactose per calcium
They only need about 3 or 4 eight ounce cups of milk
https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/calcium-intake-and-absorption
"Calcium-rich foods include:
Plain, low-fat yogurt: 415 mg per 8 ounces
Cheddar cheese: 307 mg per 1.5 ounces
Nonfat milk: 299 mg per 8 ounces
Fortified orange juice: 300 mg per 8 ounces
Salmon: 181 mg per 3 ounces
Kale: 100 mg per 1 cup
Raw broccoli: 21 mg per 1/2 cup"
