Table 2. Overall mean values of selected kinematic parameters of boar semen recorded during the four seasons.
| Parameter | Spring f | Summer | Autumn | Winter |
| TMot (%) | 80.1 ± 10.5 a | 73.4 ± 13.3 b | 73.7 ± 14.4 b | 80.1 ± 10.4 a |
| PMot (%) | 74.1 ± 13.2 a | 64.9 ± 16.5 b | 64.6 ± 17.8 b | 75.2 ± 12.3 a |
| VAP (µm/sec) | 66.4 ± 12.2 a | 59.0 ± 12.7 b | 60.1 ± 14.2 b | 73.5 ± 9.8 c |
| VCL (µm/sec) | 126.8 ± 28.7 a | 112.9 ± 29.1 b | 119.6 ± 32.4 c | 143.4 ± 25.6 d |
| VSL (µm/sec) | 52.7 ± 9.4 a | 47.1 ± 9.9 b | 46.5 ± 10.8 b | 57.2 ± 8.53 c |
| ALH (µm) | 2.98 ± 0.63 a | 2.86 ± 0.65 b | 3.05 ± 0.72 a | 3.33 ± 0.61 c |
| BCF (Hz) | 36.6 ± 3.2 a | 34.5 ± 3.5 b | 33.8 ± 4.5 c | 37.3 ± 2.94 d |
| STR (VSL/VAP) | 0.79 ± 0.08 a | 0.80 ± 0.07 a | 0.77 ± 0.08 b | 0.78 ± 0.08 b |
| WOB (VAP/VCL) | 0.53 ± 0.06 a | 0.53 ± 0.06 a | 0.51 ± 0.06 c | 0.52 ± 0.06 d |
| LIN (VSL/VCL) | 0.42 ± 0.08 a | 0.43 ± 0.08 a | 0.40 ± 0.08 b | 0.41 ± 0.08 c |
Values are reported as means ± SD of 4837 ejaculates from 702 boars. a, b, c, d Within the same row, different superscripts show significant difference at P < 0.05. e Spring = March–May; Summer = June–August; Autumn = September–November; Winter = December–February. TMot = total sperm motility; PMot = progressive sperm motility; VCL = curvilinear velocity; VAP = average path velocity; VSL = straight-line velocity; ALH = amplitude of lateral head displacement; BCF = beat cross frequency; STR = straightness of track; WOB = wobble; LIN = linearity of track.