Table 2.

Heritability and standard error (SE) values for all variables calculated from the estimated REML variance component analysis

Lactation number	Milk	SE	Fat	SE	Protein	SE
1	0.47	0.003	0.45	0.003	0.41	0.003
2	0.36	0.003	0.38	0.003	0.32	0.003
3	0.29	0.004	0.32	0.004	0.26	0.004
4	0.25	0.005	0.27	0.005	0.22	0.005
5	0.21	0.007	0.23	0.007	0.19	0.007