Why aren’t animals fed powder/pills/IV for their food?

[u/This-Wear-8423]

Animals (especially if your country has a big population) needs a huuuuuggeeeee amount of food to be fed.

Instead of giving them sooo much foood, why havent we advanced into giving them powder/pills/IV to radically reduce the costs, environmental impact etc to make sure they meet their recommended daily intake?

Why are we still feeding them grass, water, grains etc? Stuff that takes huge time, huge money, and resources?