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
13	2006	The Netherlands	R&W	151238	339	8205	7692	4.51	3.54			w.koops@pz.agro.nl
11	2005	The Netherlands	B&W	620777	349	9257	8469	4,39	3,49
12	2005	The Netherlands	R&W	154926	332	7944	7539	4,56	3,56
9	2004	The Netherlands	B&W	638251	351	9218	8403	4,37	3,48
10	2004	The Netherlands	R&W	150360	334	7909	7484	4,56	3,56
7	2003	The Netherlands	B&W	634745	351	9143	8343	4,39	3,48
8	2003	The Netherlands	R&W	166424	332	7744	7358	4,57	3,56
3	2002	The Netherlands	B&W	778664	354	9117	8270	4,40	3,47	408		hammingi@cr-delta.nl
4	2002	The Netherlands	R&W	210730	335	7734	7242	4,58	3,56	392		hammingi@cr-delta.nl
5	2001	The Netherlands	B&W	784485	347	9035	8311	4,35	3,43	405		hammingi@cr-delta.nl
6	2001	The Netherlands	R&W	236604	342	7642	7325	4,52	3,54	390		hammingi@cr-delta.nl