No? Which planet do you live on?
http://www.merriam-webster.com/dictionary/cull
cull transitive verb \ˈkəl\
: to control the size of (a group of animals) by killing some animals
Culling
Livestock and production animals
Since livestock is bred for the production of meat or milk, the herd must be culled to a certain number of production or meat animals a farmer wishes to maintain. Animals not selected to remain for breeding are sent to the slaughter house, sold, or killed.
Criteria for culling livestock and production animals can be based on population or production (milk or egg). In a domestic or farming situation the culling process involves selection and the selling of surplus stock. The selection may be done to improve breeding stock, for example for improved production of eggs or milk, or simply to control the group's population for the benefit of the environment and other species.
With dairy cattle, culling may be practised by inseminating inferior cows with beef breed semen and by selling the produced offspring for meat production.[citation needed]
With poultry, males which would grow up to be roosters have little use in an industrial egg-producing facility. Approximately half of the newly hatched chicks will be male and would grow up to be roosters, which do not lay eggs. For this reason, the hatchlings are culled based on gender. Most of the male chicks are usually killed shortly after hatching.
Wildlife
In the United States, hunting licenses and hunting seasons are a means by which the population of game animals is maintained. Each season, a hunter is allowed to kill a certain amount of wild game. The amount is determined both by species and gender. If the population seems to have surplus females, hunters are allowed to take more females during that hunting season. If the population is below what is desired, hunters may not be permitted to hunt that particular game animal or only hunt a restricted number of males.
Populations of game animals such as elk may be informally culled if they begin to excessively eat winter food set out for domestic cattle herds. In such instances the rancher will inform hunters that they may "hunt the haystack" on his property in order to thin the wild herd to controllable levels. These efforts are aimed to counter excessive depletion of the intended "domestic" winter feed supplies. Other managed culling instances involve extended issuance of extra hunting licenses, or the inclusion of additional "special hunting seasons" during harsh winters or overpopulation periods, governed by state fish and game Agencies.
Culling for population control is common in wildlife management, particularly on African game farms and in Australia in national parks. In the case of very large animals such as elephants, adults are often targeted.
