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
1	2009	USA	Ayrshire	585	371	8748	7744	3.93	3.17		AgSource	jmarshall@agsource.com
2	2009	USA	Brown Swiss	3158	381	10465	8863	4.09	3.36		AgSource	jmarshall@agsource.com
3	2009	USA	Guernsey	1222	378	8699	7467	4.59	3.36		AgSource	jmarshall@agsource.com
4	2009	USA	Holstein	312928	373	12760	11059	3.68	3.03		AgSource	jmarshall@agsource.com
5	2009	USA	Jersey	12225	364	8933	7815	4.65	3.6		AgSource	jmarshall@agsource.com
6	2009	USA	Milking Shorthorn	339	359	8109	7298	3.93	3.11		AgSource	jmarshall@agsource.com