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
9	2008	The Netherlands	737979	357	9480	9480	4.36	3.51			w.koops@pz.agro.nl
8	2007	The Netherlands	736570	353	9395		4,37	3,50			w.koops@pz.agro.nl
7	2006	The Netherlands	753207	351	9237		4.40	3.51			w.koops@pz.agro.nl
6	2005	The Netherlands	781619	346	8983	8174	4,42	3,51	413
5	2004	The Netherlands	817994	347	8903	8178	4,40	3,49
4	2003	The Netherlands	811125	347	8844	8127	4,42	3,49
3	2002	The Netherlands	995527	350	8816	8070	4,43	3,49	405		hammingi@cr-delta.nl
1	2001	The Netherlands	926745	342	8713	8092	4,42	3,49	402		hammingi@cr-delta.nl