1 School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142, New Zealand. a.trevarton@auckland.ac.nz.
2 School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142, New Zealand.
3 Livestock Improvement Corporation, Newstead, New Zealand.
4 Auckland Cytometry, Faculty of Sciences, The University of Auckland, Auckland, New Zealand.
5 School of Agriculture and Environment, Massey University, Palmerston North, New Zealand.