What are pul-ling and stri-ling?

Pulling and striling are terms used in the context of animal husbandry and breeding. "Pulling" typically refers to the removal of unwanted traits from a breeding line or the selection of animals based on specific desirable characteristics. "Striling," on the other hand, is less commonly referenced but can refer to the practice of selecting and breeding animals to enhance certain traits or behaviors. Both practices aim to improve the overall quality and performance of livestock.