Key	Year	Country	Breed	Number of lactations	Length of the lactations (days)	Milk yield per recorded cow (kg)	Milk per cow in 305 days (kg)	Percent of fat content (%)	Percent of protein content (%)	Calving interval (days)	Others	E-mail address of the responsible
12	2007	The Netherlands	B&W	588973	356	9651	8720	4,34	3,48			w.koops@pz.agro.nl
13	2007	The Netherlands	R&W	139774	341	8464	7891	4,55	3,57			w.koops@pz.agro.nl
11	2006	The Netherlands	B&W	600908	354	9500	8618	4.36	3.49			w.koops@pz.agro.nl
10	2005	The Netherlands	R&W	169356	332	7883		4,55	3,56
7	2004	The Netherlands	B&W	638251	351	9218	8403	4,37	3,48
8	2004	The Netherlands	R&W	150360	334	7909	7484	4,56	3,56
5	2003	The Netherlands	B&W	634745	351	9143	8343	4,39	3,48
6	2003	The Netherlands	R&W	166424	332	7744	7358	4,57	3,56
3	2002	The Netherlands	B&W	825400	354	9075	8222	4,40	3,47	408		hammingi@cr-delta.nl
4	2002	The Netherlands	R&W	229775	335	7684	7187	4,57	3,55	392		hammingi@cr-delta.nl
1	2001	The Netherlands	B&W	784485	347	8993	8272	4,39	3,47	405		hammingi@cr-delta.nl
2	2001	The Netherlands	R&W	236604	327	7595	7289	4,55	3,55	390		hammingi@cr-delta.nl