The influence of Haemophilus somnus on bull sperms examined in vitro

The purpose of the paper is to determine the ability of direct influence of Haemophilus somnus on the bull sperms in vitro. The experiment was carried out on fresh semen of bulls of low-land black-and-white breed. During 3-hour exposure to H. somnus, the loss of progressive movement and increase in the number of dead sperms were observed. The adjacency of Haemophilus somnus to head, midpiece and flagellum was found out. H. somnus adjoins the sperms heads most frequently.