internal diameter
6.Heritabili ties of S/P, SD, primary density (PD), external diameter of secondary (EDS), external diameter of primary (EDP), internal diameter of secondary (IDS), internal diameter of primary (IDP),depth of secondary (DS) and depth of primary (DP) were 0.534, 0.137, 0.160, (0.584,) 0.080, 0.187, 0.496, 0.002 and 0.204. respectively.

