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CSIRO Division of Livestock Industries, Private Bag #5, PO Wembley, WA 6913, Australia
Department of Animal Production and Grassland, National Agricultural Research Center for Hokkaido Region, Hitsujigaoka 1, Toyohira, Sapporo 062-8555, Japan
School of Animal Biology, Faculty of Natural & Agriculture Sciences, University of Western Australia, Crawley, 6009 WA, Australia