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Frequency of antiparasitic – treatment of breeding reindeer in autumn/early winter 2002–2004 with ivermectin inj. 200 μg/kg s.c. or paste 200 μg/kg per os and reindeer densities (see fig 1).
| year | 2002 | 2003 | 2004 | Reindeer/km2 in summer 2003 |
| area | inject/paste | inject/paste | inject/paste | |
| 1 | 52%/24% | 57%/23% | 68%/17% | 1.6 |
| 2 | 82%/4% | 83%/4% | 75%/2% | 2.2 |
| 3 | 77%/0.2% | 87%/0.3% | 90%/0.2% | 2.8 |
| 4 | 59%/5% | 64%/5% | 66%/5% | 3.4 |
| tot | 69%/7% | 73%/7% | 75%/5% | 2.5 |
