culling

(redirected from culling rate)
Also found in: Dictionary.

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 ?
Averages ([+ or -] SEM) for culling rates and culling reasons In Fleckvieh and Braunvieh cows Breed\trait Culling rate (%) Cervicitis (%) Fleckvieh 19.
layers, breeders and broilers), poultry production system categories, age of birds and incidence rates of morbidity, mortality, case fatality and culling rate in commercial poultry farm chickens infected with HPAIV (H5N1).
Good housing conditions for cows and management practices to control health problems may lead to a reduced involuntary culling rate.
The selection and handling after purchase of these animals can greatly affect the level of health problems and culling rates in expanding dairies.
Relationships between body weight at d 109 of gestation and culling rate, feed intake, body weight and backfat thickness during lactation
What factors most contribute to high culling rates for older cows?
It was evident that culling rate of the male calves on the basis of expected predicted difference (EPD) was the highest in Karan Fries followed by Sahiwal and Murrah due to differences in respective herd-size at NDRI dairy farm.
The costs include: Premature culling rates (the biggest cost of lameness).
The study, which will examine death and culling rates for the UK's breeding males, will involve sheep consultant Lesley Stubbings.