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\section{Results and Discusion}
While the study was larger than preceding attempts, the sample number was still small when considering heritability calculations. The lack of
data date resulted in wide 95\% credible intervals, which require more samples to tighten. The heritability
indicates indicate that growth strain can be influenced by
breeding. ---discuss GS heritability with respect to teak breeding, and
dunnii-- are in line with the 0.3-0.5 reported by \cite{Murphy_2005}, they are significantly higher than the 0.02 value reported by \cite{naranjo2012early}. Density, diameter at age 2 (growth), acoustic velocity and stiffness all have
sufficient significant heritability that breeding for values of these traits is achievable, as has been reported for other species --refs--. Volumetric shrinkage has lower heritability, --contrast to other studies?-- suggesting it may require intense selection or other technologies to become manageable.
\begin{table}
...
\caption{Narrow sense heritability of measured wood properties, calculated as per equation --.}
\end{table}
Wood processors pay premiums for
timber stable and stiff
timber --ref--, while forest growers prefer to have fast growing trees as to shorten rotation lengths increasing profitability --ref--. The preferences are not always aligned, particularly within wood properties. Stiffness, used for grading logs, is positively correlated with growth-strain with a Person correlation coefficient of 0.61, a substantial unfavourable correlation requiring a trade off between the two. While zero growth-strain is
desirable, desirable to be economically viable to
process process, some unknown maximum value below which little economic loss is experienced exists. Stiffness is already used for log grades, structural timber in New Zealand requires a minimum of --val, ref-- while in Europe structural timber requires --val ref--. To met these stiffness grades at age two some compromise with the level of growth-strain is needed --describe more--. Volumetric shrinkage is moderately negatively correlated with stiffness and strain --same as other literature?-- Growth and density show only small correlations with all wood properties.
\begin{table}
\begin{tabular}{ c c c c c c }
...
\caption{Person correlation between wood properties at the individual stem level.}
\end{table}
All stems measured within each family were averaged to give correlations between properties at the family level. All
family average correlations increase in strength when compared to individual stem correlations. A very strong positive relationship is evident between growth-strain and stiffness at the family level.
\begin{table}
\begin{tabular}{ c c c c c c }
...
\caption{--Person?-- corolation between average family values for measured wood properties.}
\end{table}
The effect of the alterations made to
from the rapid method should be negligible. The linear error introduced by using big end diameter rather than average diameter of the stem will result in a slight lowering of all reported strains over the original method. Leaving the small end intact (i.e. not cutting it as in the splitting test) does not release as much strain as the original method, again lowering the growth-strain value over all samples.
While accuracy of the splitting test has been investigated –refs–, precision has not. Further work is required to determine the accuracy and precision of both tests and separate it from the natural variability within the stems.
