Current procedures for international genetic evaluation of dairy sires rely on national sire EBV information as the input data. Because raw data (i.e., daughter performance records) from participating countries are not routinely available, differences in data collection policies and genetic evaluation procedures at the national level are hidden, and measurement of genetic ties between countries is difficult. However, these factors can be important with respect to the accuracy and stability of international sire evaluations. Therefore, the objective of this study was to briefly examine differences in data collection policies between countries that participate in routine Interbull sire evaluations, and to apply several measures of genetic connectedness to data from these countries.