The present invention relates to a breeding farm for black goats, and more specifically, to a new farm animal pen capable of encaging and breeding sheep or goats. According to the present invention, the breeding farm comprises: a tunnel formed in a mountain or a hill; and a breeding cage installed in the inside of the tunnel. The cage comprises: a fence which includes a bottom surface made of an iron net having holes having a size to pass excretion and prevent feet of farm animals from being fallen, and vertical rods installed in the periphery of the bottom surface and separated at predetermined intervals to allow only a head of farm animals to be passed, and tied by reins of farm animals; and a support supporting a lower part by a bottom to separate the bottom surface from the ground. The bottom surface includes a first bottom surface to discharge stale of farm animals and the rest second bottom surface, and the first bottom surface is combined in a replaceable state.;COPYRIGHT KIPO 2016
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