Table 3.
Eigenvalues, percent of cumulative explained variance and loadings of first five principal components of PCA of semen variables in frozen – thawed African Penguin samples.
| PC1 | PC2 | PC3 | PC4 | PC5 | |
|---|---|---|---|---|---|
| Eigenvalue | 5.28 | 3.51 | 1.28 | 0.82 | 0.82 |
| Cumulative variance percentage | 40.59 | 67.62 | 77.51 | 83.80 | 90.08 |
| Loadings | |||||
| Viability (%) | 0.23 | -0.51 | -0.22 | 0.49 | 0.55 |
| Total motility (%) | 0.60 | -0.57 | -0.40 | -0.34 | 0.16 |
| Progressive motility (%) | -0.09 | -0.53 | -0.55 | 0.42 | -0.30 |
| Rapid (%) | -0.81 | -0.11 | -0.29 | 0.10 | -0.13 |
| Slow (%) | 0.63 | -0.55 | -0.33 | -0.38 | 0.17 |
| VCL (µm/s) | -0.77 | 0.33 | -0.36 | -0.25 | 0.16 |
| VSL (µm/s) | -0.90 | -0.29 | -0.13 | -0.02 | -0.13 |
| VAP (µm/s) | -0.93 | 0.01 | -0.25 | -0.13 | 0.00 |
| LIN (%) | -0.31 | -0.87 | 0.34 | 0.01 | -0.08 |
| STR (%) | -0.18 | -0.87 | 0.18 | -0.19 | -0.14 |
| WOB (%) | -0.41 | -0.79 | 0.36 | -0.03 | -0.01 |
| ALH (µm) | -0.91 | 0.12 | -0.07 | -0.10 | 0.23 |
| BCF (Hz) | -0.64 | -0.04 | 0.30 | 0.04 | 0.48 |
PC – Principal component, VCL = curvilinear velocity, VSL = straight-line velocity, VAP = average path velocity, LIN = linearity, STR = straightness, WOB = wobble, ALH = amplitude of lateral head displacement, BCF = beat cross frequency.