Lactation records used in the present study were of Fleckvieh cows, calveing in two successive years (1990 and 1991), from the official Federation of Austrian Cattle Breeders (ZAR).  Normal 305-day milk yield (305-day MYT) records and calculated cumulative milk yield traits (CMYT) of each of three periods were used.  First cumulative 31-120 day (CMRS₁), 2^nd cumulative 61–150 day (CMRS₂) and 3^rd cumulative 31–150 day (CMRS₃) represent the milk records of 1^st lactation only.  Monthly test-day records were computed and used for genetic evaluation.   Available data consisted of  19000, 27158 and 18999 lactation records of daughters sired by  1424, 1748 and 1424 for CMRS₁, CMRS₂ and CMRS₃, respectively.    Yields of 305-day and calculated cumulative milk – (MY & CMY), fat – (FY & CFY), protein – (PY & CPY), fat – plus – protein – (FPY & CFPY) and protein/fat ratio – (PY/FY% & CPY/FY%) were studied in CMRS₁ to CMRS₃.  Estimates of heritability (h²) for CMYT under different cumulative milk recording system CMRS ranged from 0.32 to 0.43, while for 305-day MYT h² ranged from 0.48 to 0.59.  However, estimates of coefficients of additive genetic variation (CAGV%) for CMYT under different CMRS ranged from 6.2 to 7.5%, while for 305-day MYT, CAGV% ranged from 6.2 to 7.7%.  Generally, the highest estimates of h² and CAGV% on CMYT were found under CMRS₂.  However, the estimates of h² for cumulative fat yield (CFY) and percentage of protein yield/fat yield – (CPOF%) under CMRS were higher than those for all studied CMYT.  Estimates of genetic correlation (r_G), phenotypic correlation (r_P) and environmental correlation (r_E) between 305-day MYT and CMYT under different CMRS were generally positive, varying from moderate to high.  Selection for CMYT under the CMRS₂ had the highest correlated response in relation to 305-day MYT.  Therefore, these results suggest that, attempts to increase CMYT by selection would increase 305-day MYT nearly as much as direct selection.