1. DairyNZ Ltd, Canterbury Agricultural & Science Centre; Gerald Street Lincoln New Zealand
2. School of Biological Sciences; University of Canterbury; Private Bag 4800 Christchurch, 8140 New Zealand
3. Canterbury Regional Council; PO Box 345 Christchurch, 8140 New Zealand
4. School of Biology and Ecology; University of Maine; Orono ME 04469 U.S.A
5. Department of Biological Sciences; Missouri University Science & Technology; Rolla MO 65409 U.S.A