Answer: culling

AnswerCrossword Clue
cullingreduce or control the size of (as a herd) by removal (as by hunting) of especially weaker animals
cullinghunt or kill (animals) as a means of population control
cullingto select from a group choose culled the best passages from the poet's work
cullingthe act of selecting (to choose (to select by preference))
cullingto select the best parts of