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
2	2012	Northern Ireland	28112	347	8790	7830	4.03	3.22	413		TonyC@nmr.co.uk
1	2011	Northern Ireland	21197	348	8810	7890	3.97	3.24	411		RichardN@nmr.co.uk