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
10	2010	POLAND	598402	305	6980	6980	4,18	3,35	430		d.radzio@pfhb.pl
9	2009	POLAND	579910	305	6935	6935	4,17	3,33	427		d.radzio@pfhb.pl
8	2008	POLAND	567477	305	6817	6817	4,14	3,34	429		d.radzio@pfhb.pl
7	2007	POLAND	526889	305	6688	6688	4,22	3,33	426		d.radzio@pfhb.pl
6	2006	Poland	520666	305	6664	6664	4,18	3,32	420		d.radzio@pfhb.pl
5	2005	Poland	511464	305	6508	6508	4,21	3,32	416		hb@kchz.agro.pl
4	2004	Poland	481334	305	6152	6152	4,22	3,31	419		hb@kchz.agro.pl
3	2003	Poland	470722	305	5851	5851	4,23	3,28	414		hb@kchz.agro.pl
2	2002	Poland	448051	305	5712	5712	4,19	3,28	408		hb@kchz.agro.pl
1	2001	Poland	419097	305	5597	5597	4,19	3,31	401		hb@kchz.agro.pl