replacement boar is any intact (uncastrated) male pig intended for use in the breeding herd, but which has not yet been used for breeding. A service boar is any boar that is being, or has been, used for breeding purposes.
The Wild Boar (Sus scrofa) is the wild ancestor of the domestic pig. It is native in woodlands across much of Central Europe, the Mediterranean Region (including North Africa's Atlas Mountains) and much of Asia as far south as Indonesia, and has been widely introduced elsewhere. It is in the same Suidae biological family as the Warthog and Bushpig of Africa, the Pygmy Hog of northern India, Babirusa of Indonesia and others.