Lipids and health / Lipides et santé
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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 + ++ +