The farm of the Grange de la Haute Vallée in Pignou has obtained the level 3 Haute Valeur Environnementale (High Environmental Value) label. It constitutes the highest level of certification, only awarded to farms with a high degree of biodiversity linked to low dependence on inputs (pesticides, food supplements, etc.). Some 90% of the farms committed to such an approach raise cattle for meat (55%) or milk (21%). Most of the milk is transformed into cheeses granted PDO (Protected Designation of Origin) designations for their remarkable quality.