| Titre : | Goose damage to grassland and winter cereals by White-fronted and Bean geese (Anser albifrons and A. fabalis) in the Lower Rhine area, Germany |
| Auteurs : | Johan H. Mooij, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (39(4) Dec., 1998) |
| Article en page(s) : | 264-280 |
| Langues: | Allemand |
| Résumé : | The effect of different intensities of winter and early spring grazing by both White-fronted and Bean geese, Anser albifrons and A.fabalis, on the yields of agricultural grasslands (first grass cut) and autumn-sown wheat and barley (grain yield) was studied in the lower Rhine area of Germany. In a first phase of the study paired plots of grazed and ungrazed portions of the same grassland or winter cereal fields provided information on loss of yield at harvest. On both crops the field observations indicated a loss of yield due to goose grazing at accumulated grazing intensities more than 3000 goose days s/ha (gd/ha), but only in the more homogeneous cereal fields the results were statistically relevant. To confirm the field observations in the second phase of the study, trials were conducted with captive geese held in movable cages on both grassland swards and cereal fields. Trials at various grazing intensities were carried out, and analysis at 3000 gd/ha grazing pressure corresponding to intensities measured in the field confirmed a loss of yield in both crops. Yield losses in the study area (10-15 % on grassland, 8-14 % on cereals) at a grazing intensity of 3000 gd/ha are closely comparable to results from improved grasslands in the Netherlands and on wheat and barley crops in both England and Scotland, and comparable to values obtained on hayfields in Eastern Canada. Further studies are necessary to calibrate trials with captive geese to the field situation with wild congeners, as captive birds are expected to require less feed per day. |
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