Seed for a breeding seedling orchard produced from a factorial mating design (33 progenies) and from a diallel (four progenies) was used to establish this progeny test. Analysis of fifth- and eighth-year data showed highly significant differences between the parents (females and males) for height, diameter and stem straightness. Three heritabilities were calculated. Individual tree heritability estimates of the half sib families of females ranged from 0,03 to 0,17 while those of males ranged from 0,14 to 0,52. Full sib individual tree heritabilities ranged from 0,14 for diameter at breast height (DBH8) to 0,32 for stem straightness (STRB) at eight years. Genetic correlations between traits for half sib families of females were as high as 0,94 for fifth- and eighth-year height while that of males was up to 1,00 for the same trait.
NYOKA, B.I., BIRKS, J.S. AND GUMBIE, C.M. (1994). Pinus patula progeny test: heritability estimates and genetic correlations between fifth- and eighth-year traits. South African Forestry Journal. 168 (1) pp. 23-26. [DOI: 10.1080/00382167.1994.9629652]