These models, or "population viability analyses," assess the risk of extinction over time based on computational iterations that play out how a herd may expand and contract (with births and deaths) and genetically evolve given the interplay of the number, age and sex of animals in the herd; reproductive traits; influx of new genetics vs. inbreeding; management actions (culling/hunting); and potential effects of random events such as disease, drought and fire.
Source: tatoeba (12363552)
It is he who has done everything the club have asked of him since his arrival, including overseeing the brutal culling of many of the club's legends - Luis Suarez was thrown away in a phone call which, by all accounts, lasted less than 90 seconds.
Source: wiktionary
Culling is performed during races by stepping up on a carriage during the time the horses are coming in, and snatching reticules, silk bags, &c., from the seats of the carriage, the attention of the ladies being drawn to the winning horse.
Source: wiktionary