Joint Annual Meeting of the American-Dairy-Science-Association/Poultry-Science-Association/Asociacion-Mexicana-de-Produccion-Animal/Canadian-Society-of-Animal-Science/Western Section of the American-Society-of-Animal-Science, Colorado, Amerika Birleşik Devletleri, 11 - 15 Temmuz 2010, cilt.93, ss.219