1. CSIRO Food Futures Flagship and CSIRO Animal, Food and Health Sciences, 306 Carmody Road, St. Lucia, Brisbane, Queensland 4067, Australia
2. CSIRO Food Futures Flagship and CSIRO Animal, Food and Health Sciences, Chiswick, Armidale, New South Wales 2350, Australia
3. Laboratory of Animal Breeding and Genetics, Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan
4. Cobb-Vantress Inc., 4703 U.S. Highway 412 East, Siloam Springs, AR 72761-1030