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
6	2011	Northern Ireland	48897	337	9084	7956	4.01	3.22	427		suzanne@holstein-uk.org
5	2010	Northern Ireland	47470	337	8703	7638	4.08	3.25	429		suzanne@holstein-uk.org
4	2009	Northern Ireland	50322	333	8655	7615	4.01	3.24	429		suzanne@holstein-uk.org
3	2008	Northern Ireland	51842	337	8795	7697	3.92	3.21	424		suzanne@holstein-uk.org
2	2007	Northern Ireland	48282	331	8735	7738	3.93	3.18	421		suzanne@holstein-uk.org
1	2006	Northern Ireland	44290	327	8599	7676	3.96	3.21	419		suzanne@holstein-uk.org