Permanent pastures are therein defined as utilized agricultural area used permanently for 5 or more years through cultivation (sowing) of grass fodder crops or through natural regeneration and is not included in the farm crop rotation. This area can be used for either grazing or mowing. All grass species that are traditionally found on natural pastures or are usually included in the grass mixtures for pastures and meadows in Bulgaria are considered ‘grass fodder crops’ irrespective of whether used for grazing or not.