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	457194	305	7007	7007	4,11	3,28			d.radzio@pfhb.pl
9	2009	POLAND	448693	305	6988	6988	4,10	3,28			d.radzio@pfhb.pl
8	2008	POLAND	428721	305	6802	6802	4,12	3,27			d.radzio@pfhb.pl
7	2007	POLAND	403000	305	6789	6789	4,14	3,26			d.radzio@pfhb.pl
6	2006	Poland	402938	305	6625	6625	4,14	3,27			d.radzio@pfhb.pl
5	2005	Poland	396313	305	6352	6352	4,18	3,28			hb@kchz.agro.pl
4	2004	Poland	350520	305	6044	6044	4,18	3,27			hb@kchz.agro.pl
3	2003	Poland	213645	305	6083	6083	4,19	3,25			hb@kchz.agro.pl
1	2002	Poland	158821	305	6050	6050	4,19	3,27			hb@kchz.agro.pl
2	2001	Poland	155729	305	5856	5856	4,16	3,26			hb@kchz.agro.pl