Interrelation of Kinetic Parameters of Sperm of Servicing Bulls of the Holstein Breed with Its Fertilising Ability

Sperm motility is an essential indicator that characterises the viability and structural integrity of sperm. This parameter closely related to fertilisation capacity male germ cells, so its assessment integral part sperm analysis. The purpose this study investigate possibility predicting servicing bulls based on kinetic indicators. involved laboratory, zootechnical, statistical methods. A significant variability in parameters was revealed – from 6.2 16.1%. variation percentage motile ejaculate 78.9-89.8; progressive 50.0-74.5; velocity average path (VAP) 132.6-163.7 µm/s; straight line (VSL) 99.2-138.2 curvilinear (VCL) 223.7-272.3 straightness (STR) 73.9-85.0%, linearity (LIN) 45.1-56.1%, wobble (WOB) 57.2-63.8%. difference between minimum maximum values for all under highly likely (P<0.001). correlation various established. movement rates their relative are largely conditioned upon (r=+0.231-0.761). VAP, VSL, VCL indicators interrelated (r=+0.550-0.887). investigated fertilising ability results insemination 8,594 cows 992 heifers four farms Zhytomyr Kyiv oblasts, within 40.7-61.4%. It proved with higher described by a ejaculates, compared low capacity. pattern confirmed analysis (r=+0.538-0.675). Kinetic identified using CASA system allow identify reduced reproductive function