They might not move around much, but female cows need energy to help their calf grow inside them (if they are pregnant), and produce milk to feed their young.
Typically a lactating cow will eat 50% more than a dry cow would. As for energy needs, a lactating cow needs around 15% more energy than dry cows do.
Energy is passed from cow to cow through the food chain. Cows consume plants as their primary energy source. When one cow eats plants, it metabolizes the energy from the plants, which then gets transferred to other cows that might consume that cow as food. This flow of energy from one cow to another is known as the transfer of energy through trophic levels in a food chain.
Energy for the cow initially comes from the plants she eats and digests.
There are many energy efficient cells working in the energy conservation in a cow. These include sleeping an extra amount to digest food.
An example of a food chain with a human would be: grass (producer) -> cow (primary consumer) -> human (secondary consumer). In this chain, the human consumes the meat of the cow as a source of energy and nutrients.
because 1 cow provides only 10% energy so to get 100% we would need 10 cows
From the feed, forage or roughage they eat.
Yes.
the middle
They use this cow dung that contains methane in it to make energy.
That is immaterial, since it really cannot be measured.
cow