The layer which at least consists of the sheathing of 1 where the granulation core and the core which at least include the active material of 1 kinds are covered layer and, the fodder composition for the ruminantia animal which is included.少なくとも1種の活性物質を含む粒状化コアと、コアを被覆する少なくとも1層の被覆材料からなる層と、を含む反芻動物用飼料組成物。