A feed barrier includes a plurality of vertical flat gantries arranged in a row next to each other along a trough of a stable, each gantry determining, with the ground and said adjacent gantry or end post, an internal L-shaped space. A trap door associated with each portal and movable with respect to the latter in order to close or not close at least the lower side portion of said space, and an exclusively mechanical lock for switching the feed barrier from an access position to a locked position, and vice versa.

An enclosure for stunning animals for use in livestock/slaughterhouse operations comprising an animal-supporting floor, a plurality of upward-extending sidewalls around the floor to enclose an animal before and during stunning, and a moveable stunner mount for securing an electrical or pneumatic stunner. The enclosure comprises a second moveable stunner mount for securing a second stunner such that a single enclosure may be used for both electrical or percussive stunning operations. One or more moveable panels may be used to secure the animal within the enclosure. After moving the animal into the enclosure and securing the animal head in a position to be stunned, the animal may be stunned via an electrical or pneumatic stunner, and the animal carcass may be removed from the enclosure. The enclosure may utilize a control system having a computer program code to carry out stunning operations.