1. USDA‐ARS, Fort Keogh LARRL, Route 1, Box 2021, Miles City, MT 59301, USA
2. Organization of Complex Genomes, German Cancer Research Center, 69120 Heidelberg, Germany
3. USDA‐ARS, US Meat Animal Research Center, PO Box 166, Clay Center, NE 68933–0166, USA
4. Lehrstuhl für Tierzucht der Technischen Universität München, 85350 Freising‐Weihenstephan, Germany