Northern Prairie Wildlife Research Center
| Table 1. Mean (±95% confidence limits) values of Minnesota farm characteristics for 41 farms suffering chronic wolf depredations on cattle and 41 nearby matching farms that experienced no such losses, 1989-98. | ||
| Chronic a | Match a | |
| Farm size (ha) | 491 | 292 ± 71 |
| Number of cattle | 158 | 82 ± 18 |
| Number of years raising cattle | 38 | 35 ± 8 |
| Amount (arc°) of pasture bordered by brush-forest | 213 | 205 ± 38 |
| Longest distance livestock is from house (km) | 2.8 | 1.8 ± 0.5 |
| a Chronic farms represented a complete population, except for 2 farms, whereas matching farms were a sample. | ||
| Table 2. Types of pasture where cattle were located at 41 Minnesota farms suffering from chronic wolf depredations on cattle and 41 nearby matching farms experiencing no such losses, 1989-98. | ||
| Type of pasture | Total chronic a | Total matching a |
| Brushy | 0 | 2 |
| Open | 13 | 14 |
| Wooded | 0 | 0 |
| Open-brushy | 4 | 4 |
| Open-brushy-wooded | 11 | 7 |
| Open-wooded | 13 | 14 |
| Total | 41 | 41 |
a Chronic farms represented
a complete population, except for 2 farms, whereas matching farms were
a sample. ( = 2.96, P = 0.56). |
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| Table 3. Calving locations for 41 Minnesota farms suffering chronic wolf depredations on cattle and 41 nearby matching farms that experienced no such losses, 1989-98. | ||
| Location of calving | Total chronic a | Total matching a |
| Barn | 3 | 4 |
| Barnyard | 29 | 25 |
| Barn and barnyard | 0 | 3 |
| Pasture | 7 | 6 |
| Pasture and barn | 1 | 0 |
| Pasture and barnyard | 1 | 1 |
| No calves | 0 | 2 |
| Total | 41 | 41 |
a Chronic farms represented
a complete population, except for 2 farms, whereas matching farms were
a sample. ( = 6.52, P = 0.37). |
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| Table 4. Number of times/week Minnesota farmers checked cattle at 41 farms suffering chronic wolf depredations on cattle and 41 matching farms that experienced no such losses, 1989-98. | ||
| Times stock checked | Chronic farms a | Matching farms a |
| 0 | 1 | 0 |
| 1 | 1 | 3 |
| 2 | 5 | 5 |
| 3 | 3 | 1 |
| 4 | 2 | 6 |
| 7 | 21 | 20 |
| 14 | 7 | 4 |
| Almost daily | 1 | 0 |
| More than twice/day | 0 | 2 |
| Total | 41 | 41 |
a Chronic farms represented
a complete population, except for 2 farms, whereas matching farms were
a sample. ( = 8.84, P = 0.36). |
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The equivocal factor was method of carcass disposal. Contrary to expectations, more farms with chronic losses reported properly disposing of carcasses than did matching farms not suffering cattle depredations (Table 5). However, WS personnel indicated that they had observed evidence of at least an intermittent carcass dump on all except 2 of the 41 farms with chronic losses. Number of carcasses that matching farms disposed of varied from 2 to 10/year.
| Table 5. Carcass disposal methods for 41 Minnesota farms suffering chronic wolf depredations on cattle and 41 nearby matching farms that experienced no such losses, 1989-98. | ||
| Carcass disposal method | Total chronic farms a | Total matching farms a |
| Bury | 24 | 13 |
| Burn | 3 | 4 |
| Carcass dump | 1 | 3 |
| Carcass dump and burn | 0 | 1 |
| Rendering plant | 3 | 2 |
| Leave in pasture | 2 | 10 |
| Bury and lime | 1 | 0 |
| Bury and burn | 2 | 3 |
| Leave in pasture and burn | 1 | 0 |
| Leave in pasture and feed to dogs | 1 | 1 |
| Leave in pasture and bury | 1 | 1 |
| Rendering plant and bury | 1 | 1 |
| Rendering plant and feed to dogs | 1 | 0 |
| Rendering plant and pasture | 0 | 1 |
| Unknown | 0 | 1 |
| Total | 41 | 41 |
a Chronic farms represented
a complete population, except for 2 farms, whereas matching farms were
a sample. ( = 6.15, P = 0.30). |
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Habitat-land-use characteristics for chronic farms and their matches were similar in all respects that we could measure for the 1.6-km and 4.8-km radii (Table 6). In other words, neither habitat nor land-use proportions within 1.6 or 4.8 km around farms differed between chronic and matched farms.
| Table 6. Percentage of habitat types within circles of 1.6-km and 4.8-km radii around the farms summed for 41 Minnesota farms suffering chronic wolf depredation on cattle and 41 nearby matching farms that experienced no such losses, 1989-98. | ||||
| Habitat Type | 1.6-km radius | 4.8-km radius a | ||
| Chronic farms b | Matching farms b | Chronic farms b | Matching farms b | |
| Bog-marsh-fen | 12 | 9 | 17 | 14 |
| Brushland | 10 | 10 | 9 | 9 |
| Cultivated | 19 | 22 | 15 | 16 |
| Forested | 35 | 34 | 43 | 43 |
| Hay-pasture-grassland | 23 | 22 | 13 | 14 |
| Mining | 0 | 0 | 0 | 0 |
| Urban-rural development | 1 | 1 | 1 | 1 |
| Water | 1 | 1 | 2 | 3 |
| a Chronic farm without a matching
farm not included in analysis. b One chronic farm and its match removed as the 4.8-km buffer extended outside of habitat coverage. Because results were so obviously similar, they were not tested statistically, in keeping with Chatfield (1995) and Cherry (1998). |
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