EN
The aim of the study was to evaluate the effect of different concentrations of spermatozoa in insemination dose (ID) on fertility rate of inseminated does, and on the number of all and live-born young per litter in the breed of crossbred rabbits by using certain rates of dilution. The crossbred rabbits of female strain HYPLUS PS 19 and male strain HYPLUS PS 39 were used in the experiment. In the first part of the experiment does were inseminated with ID 0.5 cm3 with the concentrations of spermatozoa from 115 to 550 x 106 in 1 cm3. In the second part of the experiment does were inseminated with the same volume of ID (0.5 cm3), however with the lower concentration, namely from 55 to 150 x 106 in 1 cm3. The particular concentrations of spermatozoa in ID had no statistically significant effect on fertility rate and number of all and live born young per litter in both parts of experiment.