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Kappeli, S.; Frohlich, E.; Gebhardt-Henrich, S.G.; Pfulg, A.; Schaublin, H.; Zweifel, R.; Wiedmer, H.; Stoffel, Michael Hubert (2011). Effects of dietary supplementation with synthetic vitamin D-3 and 25-hydroxycholecalciferol on blood calcium and phosphate levels and performance in laying hens. Archiv für Geflügelkunde, 75(3), pp. 179-184. Stuttgart: Ulmer
Kappeli, S.; Gebhardt, Sabine; Frohlich, E.; Pfulg, A.; Schaublin, H.; Stoffel, Michael Hubert (2011). Effects of housing, perches, genetics, and 25-hydroxycholecalciferol on keel bone deformities in laying hens. Poultry Science, 90(8), pp. 1637-44. Savoy, Ill.: Oxford University Press 10.3382/ps.2011-01379
