Key	Year	Country	Number of  lactations	Length of the lactations (days)	Milk yield per recorded cow (kg)	Milk per cow in 305 days (kg)	Percent fat content (%)	Percent protein content (%)	Calving interval (days)	Others	E-mail address of the responsible
6	2004	Luxembourg	17.289		7.792		4.24	3.43	400		armand.braun@herdbooks.lu
5	2003	Luxembourg	18.308		7.647		4.22	3.40	399		armand.braun@herdbooks.lu
4	2002	Luxembourg	18.714		7.424		4.23	3.39	399		armand.braun@herdbooks.lu
3	2001	Luxembourg	18.631		7.211		4.23	3.40	398		armand.braun@herdbooks.lu