Table 2 Blood flow variables in the musculophrenic vein of 5 dry cows, 5 cows with a daily milk yield of 10 kg and 5 cows with a daily milk yield of 20 kg (mean, sd, min., max.)
| Â | Group | ||
|---|---|---|---|
Variable | Dry | 10 kg milk | 20 kg milk |
Diameter of vein (cm) | 0.69 ± 0.13 (0.28 - 1.10) | 0.63 ± 0.09 (0.38 - 0.87) | 0.87 ± 0.15 (0.54 - 1.32) |
Maximum blood flow velocity (cm/s) | 61.78 ± 12.8 (30.0 - 94.9) | 118.08 ± 19.9 (77.6 - 189.5) | 119.13 ± 16.0 (78.8 - 159.8) |
Minimum blood flow velocity (cm/s) | 1.96 ± 0.40 (0.8 - 3.1) | 8.80 ± 2.80 (2.9 - 18.4) | 7.87 ± 1.40 (3.4 - 11.0) |
Mean maximum blood flow velocity (cm/s) | 30.59 ± 5.6 (15.1 - 43.5) | 81.90 ± 16.3* (45.2 - 136.3) | 85.15 ± 12.3*(59.6 - 116.5) |
Blood flow volume (l/min) | 0.52 ± 0.20 (0.0 - 1.5) | 0.70 ± 0.10 (0.5 - 0.9) | 1.57 ± 0.40 (0.8 - 3.1) |