Table 1.

Estimates of genetic change per year from segmented regressions of PBV on birth year for all cows (All Cows) or the subset of cows registered in the national herdbook (Registered cows) for six traits: milk, fat, and protein yields; SCS; PL; and DPR

Group	Trait	1981–1985	1986–1990	1991–1995	1996–2000	2001–2005	2006–2010	2011–2015
All cows	Milk	74	79	85	74	64	55	67
	Fat	2.8	3.2	2.2	2.2	2.1	2.6	3.8
	Protein	1.8	2.6	2.6	2.6	2.1	1.8	2.6
	SCS	0.014	0.016	0.005	0.014	−0.002	−0.024	−0.035
	PL	0.25	0.14	0.17	0.03	0.16	0.45	0.88
	DPR	−0.46	−0.54	−0.52	−0.42	−0.20	0.06	0.28
Registered cows	Milk	66	74	66	61	54	50	109
	Fat	2.6	3.1	1.1	1.7	1.8	2.2	6.0
	Protein	1.7	2.8	1.9	1.8	1.8	1.6	4.1
	SCS	0.011	0.006	0.012	0.010	−0.001	−0.021	−0.044
	PL	0.01	−0.02	−0.01	0.00	0.07	0.41	1.17
	DPR	−0.46	−0.48	−0.39	−0.30	−0.27	0.02	0.26