1. Dep. of Animal and Food Science Univ. of Wisconsin ‐ River Falls 410 S. Third St. River Falls WI 54022 USA
2. Western Maryland Research and Education Center Univ. of Maryland Extension 18330 Keedysville Rd. Keedysville MD 21756 USA
3. Dep. of Agronomy and Plant Genetics Univ. of Minnesota 1991 Upper Bufford Circle St. Paul MN 55108 USA
4. Dep. of Animal Science Univ. of Minnesota 1364 Eckles Ave. St. Paul MN 55108 USA