To select from a group: Choose. (Merriam – Webster)
When people cull animals, they kill them, especially the weaker members of a particular group of them, in order to reduce or limit their numbers. (Cambridge Dictionary)
If items or ideas are culled from a particular source or number of sources, they are taken and gathered together. (Collins Dictionary)
To cull animals means to kill the weaker animals in a group in order to reduce their numbers. (Collins Dictionary)
Reduce the population of (a wild animal) by selective slaughter. (Oxford Dictionaries)
Should animal cull be stopped?