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culling
In biology, culling is the process of segregating organisms from a group according to desired or undesired characteristics. In animal breeding, culling is the process of removing or segregating animals from a breeding stock based on specific criteria. This is done either to reinforce or exaggerate desirable characteristics, or to remove undesirable characteristics from the group. For livestock and wildlife, culling often refers to the act of killing removed animals. In fruits and vegetables, culling is the sorting or segregation of fresh harvested produce into marketable lots, with the non-marketable lots being discarded or diverted into food processing or non-food processing activities. This usually happens at collection centres located at, or close to farms. Culling is sometimes used as a term to describe indiscriminate killing within one particular species which can be due to a range of reasons, for example, badger culling in the United Kingdom.
==Origin of the term==
The word comes from the Latin ''colligere'', which means "to collect". The term can be applied broadly to mean sorting a collection into two groups: one that will be kept and one that will be rejected. The cull is the set of items rejected during the selection process. The culling process is repeated until the selected group is of proper size and consistency desired.
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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