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By: Vielguth, Jurgen - Kirchhöfel, Kerstin - Jlner, Timo A - Hoppmann, AnneType: ArticleIn: The Avicultural magazineVolume: 118Series:Issue: 1Date: 2012Page Range: 32--36Publication Info: Ascot, Berkshire, etc Avicultural Society, etcSubjects: