The feeding of the pig is so important that this ham is basically classified according to the amount of acorns consumed before slaughter. This is the only official classification allowed for Iberian hams, and must appear on the label of the ham.
Jamón de Cebo ibérico, is identified by the white label, and refers to Iberian pigs which have been undergone an intensive feeding regime consisting of cereals and pulses.
Jamón Cebo de Campo ibérico, is identified by the green label, and refers to Iberian pigs reared in reserves and with a feeding regime based on cereals and pulses, alternating with natural meals, so that the quality of its meat is favoured by its free-range movement.
Jamón de Bellota ibérico, is identified by the red label, for hams from 75% pure-bred Iberian pigs, fed on acorns and natural meals during the Montanera period.
Jamón de bellota 100% ibérico, the highest quality of Iberian ham is identified by the black label, from 100% pure-bred Iberian pigs fed in the – Montanera– oak tree forest reserves on acorns and natural meals. These are the only hams that can carry the name Jamones Pata Negra.