Key	Year	Country	Breed	Number of lactations	Length of the lactations (days)	Milk yield per recorded cow (kg)	Milk per cow in 305 days (kg)	Percent of fat content (%)	Percent of protein content (%)	Calving interval (days)	Others	E-mail address of the responsible
7	every year	Belgium (Wallonia Region)	all								all cows in milk recording = all cows in herdbook (main + supplementary sections)	jeanfrancois.duckertsatspw.wallonie.be