>Is there a scientific explanation for why the two are separated in lifestock feed advertising or is it just marketing?
Because they’re wildly different in appearance and nutritional content
Grass and Hay are both very bulky but not very nutrient rich, that’s why cows have 4 stomachs to help them break down grass and get the nutrients
Grain is wayyy denser in nutrients. A pound of grass hay has about 900 calories for the cow but a pound of feed corn has about 1500 calories, and corn is about 3x denser than hay so the same volume of corn contains about 5x the amount of calories making it a lot easier to fatten up a cow off grains like corn than just grass
The cow is going to eat until its stomach feels full. If you’re feeding it grain then its going to eat a lot more calories and pack on a lot more fat than if you were just feeding it low density hay
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