culling

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culling

(kul'ing)
1. The process of removal of abnormal or damaged blood cells from the circulation by the spleen.
2. In public health, slaughtering herds of potentially infected animals, to prevent the spread of diseases like avian influenza or mad cow disease to humans.
See: pitting; spleen

culling

removal of inferior animals from a group of breeding stock. The removal is premature, i.e. before completion of its life span, disposal of an animal from a herd or other group. In farm animals this means disposal because of their being superfluous to the needs of the group to maintain its size. Animals may be culled because of age, either because thay are too old or because they are very young and their retention would necessitate culling an older, more desirable animal. Animals may also be culled because of disease, failure to produce or reproduce, because of inherited defects or because of undesirable conformation or breed type. There are two general classes of culls, involuntary culls, e.g. deaths, and voluntary culls, e.g. age culls.

biological culling
culling of animals on the biological grounds of incapacity to pass a productivity test.
culling program
a set of rules for a manager to follow in carrying out culling within a herd.
culling rate
the number of animals culled as a proportion of the number of animals from which the culling was done.
References in periodicals archive ?
Therefore, successful lionfish culling programs must be maintained over a long-term period until a more permanent form of lionfish eradication is discovered and implemented.
A more aggressive deer culling program in Irondequoit, New York, did have a significant impact, roughly halving collisions with deer from from 227 in 1992 to about 100 annually in the late 1990s, Hedlund says.
Although the details of the culling program have not been finalized, the federal government has recommended that all cattle on ranches where cases of the disease have been found be killed.
Moreover, Burgess points out, culling programs kill many nondangerous sharks, thereby harming ocean ecosystems that need these large predators to keep smaller species in check.