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Livestock dehorning
Dehorning is the process of removing the fully grown horns of livestock. Cattle, sheep, and goats are sometimes dehorned〔(【引用サイトリンク】title=RCVS List of Mutilatory Procedures )〕〔(【引用サイトリンク】title=Pain in animals )〕 for economic and safety reasons. Disbudding is a different process with similar results; it cauterizes and thus destroys horn buds before they have grown into horns. Disbudding is commonly performed early in an animal's life, as are other procedures such as docking and castration.
Many breeds of cattle and sheep are naturally hornless polled and therefore do not need to be dehorned or disbudded. Most other livestock species cannot easily be bred to lack horns naturally. In one case, the poll gene in goats was linked to hermaphrodism in a single study several decades ago, although fertile polled goats have been bred.
Horns are removed because they can pose a risk to humans, other animals and to the bearers of the horns themselves (horns are sometimes caught in fences or prevent feeding). Dehorning is normally performed with local anesthesia and sedation by a veterinarian or a trained professional. Removal of larger horns is usually performed during spring and autumn to avoid fly season. In very large horns, "tipping" (removal of the tip of the horn) may be recommended to minimize bleeding. Dehorning is not routinely performed, since it is a difficult and painful process for the animal. Instead, most responsible breeders disbud (see below)their animals while young, when the process is quick and easy. Dehorning is controversial, considered by some concerned with animal welfare to be cruelty because of the pain it can cause.
==Rationale==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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