Of the energy that is absorbed from an animal's food some goes to build up, maintain or repair its body and some may be stored as fat that can later be used as an energy source.
(some; may be stored; as fat) (fat; can be used; as an energy source; T:later) (some; to build up; )
some fat some
may be stored can be used to build up
as fat
as an energy source T:later