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Table 2 Semen characteristics in young (n = 9) and adult (n = 9) bulls

From: Pulse wave Doppler ultrasound of testicular arteries and their relationship with semen characteristics in healthy bulls

  Yong bulls Adult bulls
  Mean ± SD Mean ± SD
Volume, mL 5.1 ± 1.5a 9.2 ± 2.3b
Concentration, ×106/mL 856 ± 221a 1148 ± 324b
Total sperm per ejaculate, × 109 5.6 ± 1.1a 9.1 ± 1.4b
Membrane integrity, % 87.2 ± 8.4a 86.8 ± 7.1a
Total motility, % 91 ± 4a 89 ± 5a
Progressive motility, % 84 ± 5a 81 ± 5a
VAP, μm/s 121.4 ± 30.6a 127.9 ± 32.7a
VSL, μm/s 108.9 ± 25.9a 99.3 ± 21.9a
VCL, μm/s 162.9 ± 53a 184.6 ± 43.6a
ALH, μm 5.6 ± 2.3a 6.8 ± 2.1a
BCF, Hz 38.1 ± 10.7a 40.2 ± 9.5a
STR, % 89 ± 9a 87 ± 7a
LIN, % 69 ± 7a 62 ± 6a
  1. Average path velocity (VAP); straight line velocity (VSL); curvilinear velocity (VCL); amplitude of lateral head displacement (ALH); beat cross frequency (BCF); straightness (STR); linearity (LIN)
  2. Means bearing different superscripts (a and b) in a row differ significantly (P < 0.05)