1. a Faculty of Animal Husbandry , University of Jambi , Jambi , Indonesia
2. b Department of Poultry Science , Pennsylvania State University , University Park , Pennsylvania , USA
3. c Department of Horticulture , Pennsylvania State University , University Park , Pennsylvania , USA
4. d Pennsylvania State University Cooperative Extension-Livestock , Leesport , Pennsylvania , USA
5. e Pennsylvania State University Cooperative Extension-Poultry , Lancaster , Pennsylvania , USA
6. f United States Department of Agriculture (USDA)-National Resources Conservation Service (NRCS) , Harrisburg , Pennsylvania , USA
7. g United States Department of Agriculture (USDA)-National Resources Conservation Station (NRCS) , Big Flats Plant Materials Center , Corning , New York , USA
8. h Department of Natural Resource Ecology and Management , Iowa State University , Ames , Iowa , USA