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
8	2007	México	Holstein	41,452	365	8433	9374	3.41	3.21	445	Only cows with more than than 305 dim are considered for 365 d production	roberto.iturralde@holstein.com.mx
7	2006	México	Holstein	44,158	365	8,542	8778	3.40	3.17	444	Only cows with more than 365 d production	roberto.iturralde@holstein.com.mx
6	2005	México	Holstein	43,283	365	8555	9083	3.39	3.20	445	Only cows with more than 305 dim are considered for 365 d production	roberto.iturralde@holstein.com.mx
4	2004	México	Holstein	39,578	365	8,268	9,698	3.46	3.13	444	n.a.	holstein2004@prodigy.net.mx
5	2003	México	Holstein	43,785	365	8288	9483	3.45	3.16	428	n.a	holstein2004@prodigy.net.mx
2	2002	México	Holstein	40,967	365	8,225	n.a.	3.56	3.23	441	n.a.	holstein2004@prodigy.net.mx
1	2001	México	Holstein	43,685	365	8,068	8,124	3.52	3.24	435	n.a.	holstein2004@prodigy.net.mx