Partially thanks to the arrival of genomics, there are fewer and fewer bulls from which the descendants are born with difficulty, or from whom the daughters themselves have a hard time calving. Nevertheless, there are still significant differences among sires. For dairy farmers who want to minimize calving problems, what do they need to pay attention to? HI sheds light on the indexes for calving ease and daughter calving ability in various prominent Holstein countries: And reports on significant index modifications in the US.