Kształtowanie się użytkowości mlecznej mieszańców 75-procent HF w porównaniu z ich matkami oraz rówieśnicami półkrwi

The studies have been carried out on 202 black-white and red-white hybrids of various blood percentage. The results of the studies have enabled the initial evaluation of 75% HF hybrids. The black-white hybrids produced in the first lactation 649 kg of milk more than their mothers whereas the red-white hybrids proved to be better by 707 kg. Fat yield in both populations of the hybrids was higher compared to that in their mothers. 75% HF hybrids /R₁/ had higher milk yield than their F₁ contemporaries /150 kg in black-white and 602 kg in red-white/ genotype respectively.