Which of the following characteristics is not important in beef cattle breeding?

Increased butter-fat percentage is not important in beef cattle breeding. This is because butter-fat content is more relevant to dairy cattle breeding, which is aimed at producing milk with high fat content. In beef cattle breeding, the focus is on producing animals with a high yield of lean meat and good feed conversion efficiency. Lean meat yield is important because it is the part of the carcass that is consumed by humans, while feed conversion efficiency is important because it determines how efficiently the animal converts feed into muscle. High fertility is also important in beef cattle breeding because it ensures that the herd size can be maintained or increased. Therefore, while all the options listed may be important in different types of animal breeding, increased butter-fat percentage is not relevant to beef cattle breeding.