The results presented in Table 2 demonstrate that the boars of both control and experimental groups achieved similar levels of the selection index (122 and 116 pts.).
On the moment of starting the experiment (at 70 days of age), the boars had similar volume of both testes. At 180 days of age the volume testes of young boars of control group shaped 625 cm3 and the experimental group 654 cm3. The differences found between the groups were, however, statistically non-significant. The time mounting upon phantom, number of mounts and time of ejaculation in both groups of boars were similar.