Question

why only ruminents can convert roughage into protein and energy​

Answer 1

Answer:

Non-ruminants do not have the ability to handle large amounts of fiber in their diets and thus the energy obtained from the diet will decrease sharply as diet fiber (NDF) increases above 20%. Actually high fiber diets have been recommended as a way to control obesity in humans.

Answer 2

Answer:

Ruminant has no amino acid requirement. Instead, they have a nitrogen requirement. Ruminants break down dietary protein into ammonia and C skeleton through rumen microbes and synthesize their own microbial protein. Therefore, a portion of a ruminant's protein requirement can be met with nonprotein nitrogen (NPN).