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 ?
BLV infected cows have a higher culling rate due to higher susceptibility to opportunistic and infectious agents (mastitis, lameness diseases, ringworm infection etc.
In the present study, the seasons of birth didn't differ significantly for any of the seminal parameters, however, in a study on buffalo, the male calves born during spring season were found to have higher culling rate (Kodagali et al.
The key data looked at performance indicators such as cow and ewe weight, culling rates, liveweight of finished animals, daily liveweight gain, fertiliser use and feed use.
6ppl requires action in a number of areas including reducing the number of heifers kept and reared, reducing the age at calving, reducing culling rates and so the number of replacements, and maximising cull cow value and minimising those that leave with no value.
It is expected that culling rates will continue at the current relatively high rate of 16% seen during the past two years.
This is drastically undersupplying their energy requirements in early lactation, which is manifesting itself in infertility, high calving indices and high culling rates, with subsequent reduction in overall farm profitability.
The higher culling rates and lower ewe lamb retentions of 2005 are expected to leave a national flock going into the 2006 season some 200,000 down on last year at around 16.
Chief technical officer Duncan Rose said: "While milk price penalties are foremost in dairy farmers' minds, there are also many other hidden costs associated with high cell counts, including depressed yields and higher culling rates.