From: Genetic analysis of egg production traits in turkeys (Meleagris gallopavo) using a single-step genomic random regression model
\(\left[\begin{array}{cccc}0.73& -0.03& -0.12& 0.04\\ -0.03& 0.18& -0.01& -0.06\\ -0.12& -0.01& 0.09& -0.01\\ 0.04& -0.06& -0.01& 0.05\end{array}\right]\)