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
1	every year	Belgium (Wallonia Region)								all cows in milk recording = all cows in herdbook	jeanfrancois.duckertsatspw.wallonie.be