Different extraction methods were studied in mixed beech and oak forests in north-western Turkey. The average extraction distance was 100 m (109 yd), and the slope ranged between 20 to 40%, averaging 30%. The average productivity for each system is as per the table below.
| Extraction machine | Productivity (m3/hour) |
| Animals (oxen) | 3.80 |
| Tractor skidding | 6.24 |
| Hauling with farm tractor | 2.8 |
| Hauling with forest tractor | 5.25 |
| Extraction with skyline | 10.09 |
The greatest amount of time for each machine was the skidding time. The tractor became very expensive when extraction distances exceeded 150 m. Source: http://link.springer.com/article/10.1007/s11842-013-9239-1