RESUMEN.- La raza Holstein Friesian es la raza de leche más numerosa de Uruguay y del mundo, donde se han reconocido 46 enfermedades hereditarias con mutación conocida, la mayoría en menos de 10 años (OMIA, 2024). En el presente estudio, se demuestra el ingreso de material genético al país de animales portadores para todos los haplotipos de fertilidad analizados, siendo de particular interés el HH5. Asimismo, se demuestra la permanencia de los haplotipos HH1 y HH3 en el rodeo comercial, documentados previamente. -------------------------------- ABSTRACT.- The Holstein Friesian breed is the most numerous dairy breed in Uruguay and globally, where 46 hereditary diseases with known mutations have been recognized, most of them in less than 10 years (OMIA, 2024). In the commercial herd, female carriers for HH1 (1.2%) and HH3 (1.2%) were found. No female carriers of HH4 were detected. This study demonstrates the entry of genetic material into the country from carrier animals for all analyzed fertility haplotypes, with HH5 being of particular interest. Additionally, it confirms the persistence of the previously documented haplotypes HH1 and HH3 in the commercial herd.