Table 1
Changes in silage maize and grassland areas, soybean meal imports and rapeseed meal from 1960 to the present, with qualitative impact assessment of the balance between n-3 and n-6 polyunsaturated fatty acids (PUFAs). Symbols (+, =, −) indicate trends in area (silage, grassland) or quantity (meals) and their influence on the n-6:n-3 PUFA ratio, respectively.
| Silage maize and grass | Soybean | Rapeseed | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Period | Maize | Permanent grasslands | Temporary grasslands | Alfalfa | Influence on PUFA ratio | Imports | Influence on PUFA ratio | Supply | Influence on PUFA ratio |
| 1960–1980 | ++ | = | + | −− | −− | +++ | −−− | / | |
| 1980–1990 | ++ | −− | – | – | −− | ++ | −− | / | |
| 1990–2000 | = | – | = | (−) | – | + | – | + | (+) |
| 2000–present | = | – | + | 0 | 0 | – | + | ++ | + |
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