Table 2. Narrow sense heritabilities (h2) and type-B genetic correlations (rB) with standard errors (SE) (all rB are significant p < 0.01) in the studied open-pollinated Betula pendula progeny trials at the age of 10 and 14 years.
	h2 ± SE								rB ± SE
Trial	Taurene		Ukri		Rembate		Ukri & Taurene together
Age (years)	10	14	10	14	10	14	10	14	14
H	0.37 ± 0.03	0.45 ± 0.04	0.47 ± 0.04	0.64 ± 0.04	0.30 ± 0.07	na	0.37 ± 0.03	0.52 ± 0.03	0.94 ± 0.02
DBH	na	0.45 ± 0.04	na	0.52 ± 0.03	na	0.12 ± 0.02	na	0.42 ± 0.03	0.89 ± 0.03
V	na	0.41 ± 0.03	na	0.53 ± 0.03	na	na	na	0.41 ± 0.03	0.97 ± 0.03
BrD	0.24 ± 0.03	na	0.20 ± 0.03	na	0.10 ± 0.03	na	0.17 ± 0.02	na	na
BrA	0.33 ± 0.03	0.83 ± 0.19	0.27 ± 0.03	0.61 ± 0.07	0.30 ± 0.03	0.31 ± 0.03	0.25 ± 0.02	0.37 ± 0.1	0.78 ± 0.12
SpKn	0.07 ± 0.02	0.08 ± 0.02	0.06 ± 0.02	0.05 ± 0.01	0.04 ± 0.03	0.07 ± 0.02	0.07 ± na	0.06 ± 0.02	na
Doubl	0.29 ± 0.07	0.05 ± 0.06	0.04 ± 0.03	0.19 ± 0.04	0.08 ± 0.04	0.27 ± 0.05	0.1 ± na	na	na
LostTop	0.09 ± 0.03	0.04 ± 0.02	0.06 ± 0.03	0.05 ± 0.01	0.12 ± 0.03	0.06 ± 0.02	0.05 ± 0.04	0.02 ± 0.01	na
StStr	0.45 ± 0.05	0.35 ± 0.05	0.41 ± 0.05	0.45 ± 0.05	0.32 ± 0.05	0.39 ± 0.05	0.40 ± 0.06	0.4 ± 0.05	0.97 ± 0.05
StQual	0.15 ± 0.03	0.35 ± 0.05	0.11 ± 0.03	0.21 ± 0.03	0.14 ± 0.03	0.26 ± 0.04	0.10 ± 0.03	0.23 ± 0.03	0.89 ± 0.08
H – height, DBH – diameter at breast height, V – stem volume, SpKn – spike knots, Doubl – double leaders, LostTop – lost top, StStr – stem straightness, BrD – branch diameter, BrA – branch angle, StQual – stem quality.