In April 2015, Australia was the first country in the world that published a breeding value for feed efficiency. The Netherlands followed in December 2020, and since April the USA and Canada also have a breeding value for the trait whose importance cannot be overestimated. In addition to the listed countries, all other leading Holstein nations are working on the development of breeding values for feed efficiency and are also partly publishing them. But as important as the trait is, the development of a breeding evaluation for it has been equally difficult. There is still a long way to achieving a perfect breeding evaluation. To understand this better, we need to take a closer look at the subject. Here is the update on the topic of feed efficiency for the year 2021.